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Document And Entity Information - shares	9 Months Ended
Document And Entity Information - shares	Dec. 31, 2011	Jan. 31, 2012
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2011
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Entity Registrant Name	AMERICAN SUPERCONDUCTOR CORP /DE/
Entity Central Index Key	0000880807
Current Fiscal Year End Date	--03-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		51,465,999

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2011	Mar. 31, 2011
ASSETS
Cash and cash equivalents	$ 58,605	$ 123,783
Marketable securities	5,261	116,126
Accounts receivable, net	14,764	15,259
Inventory	34,021	25,828
Prepaid expenses and other current assets	29,789	32,759
Restricted cash	9,049	5,566
Deferred tax assets	484	484
Total current assets	151,973	319,805
Property, plant and equipment, net	94,073	96,494
Intangibles, net	8,662	7,054
Restricted cash	2,540
Deferred tax assets	5,840	5,840
Other assets	12,275	12,016
Total assets	275,363	441,209
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	39,075	90,273
Adverse purchase commitments	28,763	38,763
Deferred revenue	15,246	10,304
Deferred tax liabilities	5,840	5,840
Total current liabilities	88,924	145,180
Deferred revenue	1,921	2,181
Deferred tax liabilities	484	484
Other	969	509
Total liabilities	92,298	148,354
Commitments and contingencies (Note 10)
Stockholders' equity:
Common stock	515	507
Additional paid-in capital	894,129	885,704
Treasury stock	(271)
Accumulated other comprehensive income	1,525	3,817
Accumulated deficit	(712,833)	(597,173)
Total stockholders' equity	183,065	292,855
Total liabilities and stockholders' equity	$ 275,363	$ 441,209

Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Condensed Consolidated Statements Of Operations [Abstract]
Revenues	$ 18,058	$ 31,570	$ 47,916	$ 226,853
Cost and operating expenses:
Cost of revenues	18,918	31,528	57,810	149,167
Research and development	5,928	8,417	21,339	23,610
Selling, general and administrative	15,402	14,192	54,952	46,724
Write-off of advance payment			20,551
Amortization of acquisition related intangibles	287	393	891	1,154
Restructuring and impairments	4,092		8,393
Total cost and operating expenses	44,627	54,530	163,936	220,655
Operating (loss) income	(26,569)	(22,960)	(116,020)	6,198
Interest (expense) income, net	(11)	171	232	549
Other income, net	393	2,136	1,313	4,745
(Loss) income before income tax expense (benefit)	(26,187)	(20,653)	(114,475)	11,492
Income tax expense (benefit)	84	(2,495)	1,185	12,642
Net loss	$ (26,271)	$ (18,158)	$ (115,660)	$ (1,150)
Net loss per common share
Basic	$ (0.52)	$ (0.38)	$ (2.28)	$ (0.02)
Diluted	$ (0.52)	$ (0.38)	$ (2.28)	$ (0.02)
Weighted average number of common shares outstanding
Basic	50,933	48,068	50,789	46,017
Diluted	50,933	48,068	50,789	46,017

Condensed Consolidated Statements Of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Condensed Consolidated Statements Of Comprehensive (Loss) Income [Abstract]
Net loss	$ (26,271)	$ (18,158)	$ (115,660)	$ (1,150)
Other comprehensive loss, net of tax:
Foreign currency translation losses	(1,157)	(5,386)	(2,264)	(1,215)
Unrealized (losses) gains on cash flow hedges		(1,243)		76
Unrealized losses on investments	(17)	(42)	(28)	(96)
Total other comprehensive loss, net of tax	(1,174)	(6,671)	(2,292)	(1,235)
Comprehensive loss	$ (27,445)	$ (24,829)	$ (117,952)	$ (2,385)

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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- Definition

Net of tax effect change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges after taxes. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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- Definition

Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity, net of tax.

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- Definition

This element represents Other Comprehensive Income or Loss, Net of Tax, for the period. Includes deferred gains or losses on qualifying hedges, unrealized holding gains or losses on available-for-sale securities, minimum pension liability, and cumulative translation adjustment. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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- Definition

Appreciation or loss in value (before reclassification adjustment) of the total of unsold securities during the period being reported on, net of tax. Reclassification adjustments include: (1) the unrealized holding gain (loss), net of tax, at the date of the transfer for a debt security from the held-to-maturity category transferred into the available-for-sale category. Also includes the unrealized gain (loss) at the date of transfer for a debt security from the available-for-sale category transferred into the held-to-maturity category; (2) the unrealized gains (losses) realized upon the sale of securities, after tax; and (3) the unrealized gains (losses) realized upon the write-down of securities, after tax.

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+ Details

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net loss	$ (115,660)	$ (1,150)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation and amortization	10,875	7,990
Stock-based compensation expense	7,697	10,311
Provision for excess and obsolete inventory	2,150	2,667
Adverse purchase commitment losses (recoveries), net	73
Allowance for doubtful accounts		25
Write-off of advance payment	20,551
Write-off of prepaid value added taxes		550
Restructuring charges, net of payments	2,721
Impairment of long-lived assets	2,829
Deferred income taxes		(3,902)
Other non-cash items	2,227	2,025
Changes in operating asset and liability accounts:
Accounts receivable	(1,262)	40,431
Inventory	(10,419)	(42,934)
Prepaid expenses and other current assets	3,244	(16,973)
Accounts payable and accrued expenses	(63,554)	4,945
Deferred revenue	5,254	(20,027)
Net cash used in operating activities	(133,274)	(16,042)
Cash flows from investing activities:
Purchase of property, plant and equipment	(9,332)	(30,690)
Purchase of marketable securities		(71,763)
Proceeds from sales and maturities of marketable securities	110,667	47,462
Change in restricted cash	(6,036)	250
Purchase of intangible assets	(3,893)	(2,001)
Purchase of minority investments	(1,800)	(8,000)
Advance payment for previously planned acquisition	(20,551)
Change in other assets	(734)	(30)
Net cash provided by (used in) investing activities	68,321	(64,772)
Cash flows from financing activities:
Payments in lieu of issuance of common stock for payroll taxes	(271)
Proceeds from public equity offering, net		155,240
Proceeds from exercise of employee stock options and ESPP	150	7,350
Net cash (used in) provided by financing activities	(121)	162,590
Effect of exchange rate changes on cash and cash equivalents	(104)	(351)
Net (decrease) increase in cash and cash equivalents	(65,178)	81,427
Cash and cash equivalents at beginning of period	123,783	87,594
Cash and cash equivalents at end of period	58,605	169,021
Supplemental schedule of cash flow information:
Cash paid for income taxes, net of refunds	13,482	13,660
Non-cash contingent consideration in connection with acquisitions		10,003
Non-cash issuance of common stock	$ 586	$ 637

Description Of The Business And Basis Of Presentation	9 Months Ended
Description Of The Business And Basis Of Presentation	Dec. 31, 2011
Description Of The Business And Basis Of Presentation [Abstract]
Description Of The Business And Basis Of Presentation	1. Description of the Business and Basis of Presentation American Superconductor Corporation ("AMSC" or the "Company") was founded on April 9, 1987. The Company is a leading provider of megawatt-scale solutions that lower the cost of wind power and enhance the performance of the power grid. In the wind power market, the Company enables manufacturers to field wind turbines through its advanced engineering, support services and power electronics products. In the power grid market, the Company enables electric utilities and renewable energy project developers to connect, transmit and distribute power through its transmission planning services and power electronics and superconductor-based products. The Company's wind and power grid products and services provide exceptional reliability, security, efficiency and affordability to its customers. These unaudited condensed consolidated financial statements of the Company have been prepared in accordance with the Securities and Exchange Commission's ("SEC") instructions to Form 10-Q. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with accounting principles generally accepted in the United States ("GAAP") have been condensed or omitted pursuant to those instructions. The year-end condensed balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP. The unaudited condensed consolidated financial statements, in the opinion of management, reflect all adjustments (consisting of normal recurring adjustments) necessary for a fair statement of the results for the interim periods ended December 31, 2011 and 2010 and the financial position at December 31, 2011. The unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions are eliminated in consolidation. Certain reclassifications of prior year amounts have been made to conform to current year presentation. These reclassifications had no effect on net income, cash flows from operating activities or stockholders' equity. The Company operates its business in two market-facing business units: Wind and Grid. The Company believes this market-centric structure enables it to effectively anticipate and meet the needs of wind turbine manufacturers, power generation project developers and electric utilities. Wind. Through its Windtec Solutions, the Wind business segment enables manufacturers to field wind turbines with exceptional power output, reliability and affordability. The Company licenses its highly engineered wind turbine designs, provides extensive customer support services and supplies advanced power electronics and control systems to wind turbine manufactures. The Company's design portfolio includes a broad range of drive trains and power ratings up to 10 megawatts. The Company believes its unique engineering capabilities, ranging from bearings to advanced synchronous generators to blades, enables it to provide its partners with highly-optimized wind turbine platforms. Furthermore, these designs and support services typically lead to sales of its power electronics and software-based control systems, which are designed for optimized performance, efficiency and grid compatibility. Grid. Through its Gridtec Solutions, the Grid business segment enables electric utilities and renewable energy project developers to connect, transmit and distribute power with exceptional efficiency, reliability and affordability. The Company provides transmission planning services that allow it to identify power grid congestion, poor power quality and other risks, which helps it determine how its solutions can improve network performance. These services often lead to sales of grid interconnection solutions for wind farms and solar power plants, power quality systems and transmission and distribution cable systems. On March 12, 2011, the Company entered into a Share Purchase Agreement, by and among the Company and the shareholders of The Switch Engineering Oy, a power technologies company headquartered in Finland ("The Switch"), which was amended on June 29, 2011 (as amended, the "Agreement"). Pursuant to the Agreement, the Company agreed to acquire all of the outstanding shares of The Switch. On October 28, 2011, the Company and The Switch entered into a termination agreement pursuant to which the parties mutually agreed to terminate the Agreement due to adverse market conditions for a financing required to fund the acquisition. Under the termination agreement, The Switch retained a $20.6 million advance payment as a break-up fee. As a result, the Company recorded a write-off of the advance payment during the nine months ended December 31, 2011. At December 31, 2011, the Company had cash, cash equivalents, and marketable securities of $63.9 million. The Company has experienced a substantial decline in revenues and incurred a net loss of $115.7 million during the nine months ended December 31, 2011. The Company's business plan anticipates a substantial use of cash from operations in its fiscal year ending March 31, 2012 in light of the difficult and uncertain current economic environment in China, the significant restructuring actions undertaken and the slowdown in the Chinese wind power market, which has accounted for more than two-thirds of the Company's revenues in recent fiscal years. At December 31, 2011, the Company has accrued liabilities related to adverse purchase commitments for inventory totaling $28.8 million. From April 1, 2011 through the date of this filing, the Company has reduced its global workforce by approximately 50%, which is expected to result in annual savings of approximately $50 million. As of December 31, 2011, the Company has a global workforce of over 400 persons. The Companyï¿½s cost reduction efforts and anticipated revenue growth are expected to result in a substantial reduction in cash used for operations during the fiscal year ended March 31, 2013. The Company plans to continue to closely monitor its expenses and if required, will further reduce operating costs and capital spending to enhance liquidity. The Company is working with its inventory suppliers to delay cash settlements and reduce the gross liability associated with its adverse purchase commitments. The Company believes that its available cash, together with additional reductions in operating costs and capital expenditures as necessary, will be sufficient to fund its operations, capital expenditures and other cash requirements for the next twelve months. To bolster its long-term liquidity, the Company intends to seek financing through means that may include public and private equity offerings, debt financings, and other financing alternatives. However, there can be no assurance that financing will be available on commercially acceptable terms or at all. The Company's liquidity is highly dependent on its ability to profitably grow its revenues, successfully manage its adverse purchase order commitments and raise additional capital as required. The results of operations for an interim period are not necessarily indicative of the results of operations to be expected for the fiscal year. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements for the fiscal year ended March 31, 2011 (fiscal 2010) which are contained in the Company's Annual Report on Form 10-K. The Company's fiscal year begins on April 1 and ends on March 31. This document refers to fiscal 2011, which is defined as the period beginning on April 1, 2011 and concluding on March 31, 2012. The third quarter of fiscal 2011 began on October 1, 2011 and concluded on December 31, 2011.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 2-6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Name Statement of Position (SOP)
-Publisher AICPA
-Number 94-6
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Name FASB Interpretation (FIN)
-Publisher FASB
-Number 46R
-Paragraph 4, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6359553&loc=d3e288-107754

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2197480

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6921930&loc=d3e5614-111684

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 915
-SubTopic 235
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6472506&loc=d3e38932-110933

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2209116

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 15
-URI http://asc.fasb.org/subtopic&trid=2122524

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2134480

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS140-4/FIN46(R)-8
-Paragraph 8, C1, C7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Stock-Based Compensation

9 Months Ended

Dec. 31, 2011

Stock-Based Compensation [Abstract]

Stock-Based Compensation

2. Stock-Based Compensation

The Company accounts for its stock-based compensation at fair value. The following table summarizes stock-based compensation expense by financial statement line item for the three and nine months ended December 31, 2011 and 2010 (in thousands):


		Three months ended					Nine months ended
		December 31,					December 31,
		2011		2010			2011		2010
Cost of revenues	$	138	$	(6	)	$	908	$	828
Research and development		623		237			1,948		1,396
Selling, general and administrative		1,357		2,017			4,841		7,849
Total	$	2,118	$	2,248		$	7,697	$	10,073

During the nine months ended December 31, 2011, the Company granted approximately 815,000 and 408,000 shares of stock options and restricted stock, respectively, to employees under the 2007 Stock Incentive Plan. The restricted stock granted during the nine months ended December 31, 2011 includes approximately 109,000 shares of performance-based restricted stock, which will vest upon achievement of certain financial performance measurements. The Company recognizes the fair value of the performance based awards over the estimated period of each award for which the achievement of the performance measures are probable to occur. As of December 31, 2011, the Company has assessed the weighted average probability for these awards as likely to occur and has recorded expenses accordingly. The remaining shares granted vest upon the passage of time, generally three years. For awards that vest upon the passage of time, expense is being recorded over the vesting period.

The estimated fair value of the Company's stock-based awards, less expected annual forfeitures, is amortized over the awards' service period. The total unrecognized compensation cost for unvested outstanding stock options was $7.4 million as of December 31, 2011. This expense will be recognized over a weighted average expense period of approximately 2.1 years. The total unrecognized compensation cost for unvested outstanding restricted stock was $4.0 million as of December 31, 2011. This expense will be recognized over a weighted average expense period of approximately 1.7 years.

The weighted-average assumptions used in the Black-Scholes valuation model for stock options granted during the three and nine months ended December 31, 2011 and 2010 are as follows:


	Three months ended				Nine months ended
	December 31,				December 31,
	2011		2010		2011		2010
Expected volatility	79.7	%	61.4	%	69.7	%	65.5	%
Risk-free interest rate	1.1	%	2.4	%	1.8	%	2.1	%
Expected life (years)	5.9		6.1		5.9		6.1
Dividend yield	None		None		None		None

The expected volatility rate was estimated based on an equal weighting of the historical volatility of the Company's common stock and the implied volatility of the Company's traded options. The expected term was estimated based on an analysis of the Company's historical experience of exercise, cancellation, and expiration patterns. The risk-free interest rate is based on the average of the five and seven year U.S. Treasury rates.

In conjunction with the departure of certain former executive officers, the Company agreed to modify certain vested awards by extending the period over which two former officers would be entitled to exercise stock options and accelerated the vesting of certain other outstanding awards for one former officer. Accordingly, the Company recorded stock-based compensation expense related to these modifications of $0.9 million in the nine months ended December 31, 2011.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

Computation Of Net (Loss) Income Per Common Share

9 Months Ended

Dec. 31, 2011

Computation Of Net (Loss) Income Per Common Share [Abstract]

Computation Of Net (Loss) Income Per Common Share

3. Computation of Net (Loss) Income per Common Share

Basic net (loss) income per share ("EPS") is computed by dividing net (loss) income by the weighted-average number of common shares outstanding for the period. Where applicable, diluted EPS is computed by dividing the net (loss) income by the weighted-average number of common shares and dilutive common equivalent shares outstanding during the period, calculated using the treasury stock method. Common equivalent shares include the effect of restricted stock, exercise of stock options and warrants and contingently issuable shares. For the three and nine months ended December 31, 2011 and 2010, 2.4 million shares and 2.0 million shares, respectively, and 2.4 million shares and 2.0 million shares, respectively, were not included in the calculation of diluted EPS as they were considered anti-dilutive.

The following table reconciles the numerators and denominators of the earnings per share calculation for the three and nine months ended December 31, 2011 and 2010 (in thousands, except per share data):


		Three months ended						Nine months ended
		December 31,						December 31,
		2011			2010			2011			2010
Numerator:

Net loss	$	(26,271	)	$	(18,158	)	$	(115,660	)	$	(1,150	)

Denominator:
Weighted-average shares of common stock outstanding		51,459			48,731			51,120			46,667
Weighted-average shares subject to repurchase		(526	)		(663	)		(331	)		(650	)

Shares used in per-share calculation basic		50,933			48,068			50,789			46,017

Shares used in per-share calculation diluted		50,933			48,068			50,789			46,017

Net loss per share basic	$	(0.52	)	$	(0.38	)	$	(2.28	)	$	(0.02	)

Net loss per share diluted	$	(0.52	)	$	(0.38	)	$	(2.28	)	$	(0.02	)

Fair Value Measurements

9 Months Ended

Dec. 31, 2011

Fair Value Measurements [Abstract]

Fair Value Measurements

4. Fair Value Measurements

A valuation hierarchy for disclosure of the inputs to valuation used to measure fair value has been established. This hierarchy prioritizes the inputs into three broad levels as follows:

Level 1 - Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

Level 2 - Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs).

Level 3 - Unobservable inputs that reflect the Company's assumptions that market participants would use in pricing the asset or liability. The Company develops these inputs based on the best information available, including its own data.

A financial asset's or liability's classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.

The Company presents financial asset and liability activity on a gross basis within the Level 3 measurement roll-forward and details of transfers in and out of Level 1 and 2 measurements. Changes in the hierarchy of financial assets and liabilities from its current level will be reflected in the period during which the pricing methodology of such investment changes. Disclosure of the transfer of securities from Level 1 to Level 2 or Level 3 will be made in the event that the related security is significant to total cash and investments. The Company did not have any transfers of assets and liabilities between Level 1 and Level 2 of the fair value measurement hierarchy during the three or nine months ended December 31, 2011.

The following table provides the assets carried at fair value, measured as of December 31, 2011 and March 31, 2011 (in thousands):


		Total		Quoted Prices in		Using Significant Other		Using Significant
		Carrying		Active Markets		Observable Inputs		Unobservable Inputs
		Value		(Level 1)		(Level 2)		(Level 3)
December 31, 2011:
Assets:
Cash equivalents	$	38,474	$	38,474	$	—	$	—
Short-term commercial paper		5,261		—		5,261		—



		Total		Quoted Prices in		Using Significant Other		Using Significant
		Carrying		Active Markets		Observable Inputs		Unobservable Inputs
		Value		(Level 1)		(Level 2)		(Level 3)
March 31, 2011:
Assets:
Cash equivalents	$	49,837	$	49,837	$	—	$	—
Short-term government-backed		76,371		—		76,371		—
securities
Short-term commercial paper		39,755		—		39,755		—
Derivatives		3,087		—		3,087		—

Valuation Techniques

Cash Equivalents

Cash equivalents consist of highly liquid instruments with maturities of three months or less that are regarded as high quality, low risk investments and are measured using such inputs as quoted prices, and are classified within Level 1 of the valuation hierarchy. Cash equivalents consist principally of certificates of deposits and money market accounts.

Marketable Securities

Marketable securities consist primarily of government-backed securities and commercial paper and are measured using such inputs as quoted prices for identical or similar assets in markets that are not active, inputs other than quoted prices that are observable for the asset (for example, interest rates and yield curves observable at commonly quoted intervals), and inputs that are derived principally from or corroborated by observable market data by correlation or other means, and are classified within Level 2 of the valuation hierarchy. The Company's marketable securities generally have maturities of greater than three months from original purchase date but less than twelve months from the date of the balance sheet. The Company determines the appropriate classification of its marketable securities at the time of purchase and re-evaluates such classification as of each balance sheet date. All marketable securities are considered available-for-sale and are carried at fair value. The Company periodically reviews the realizability of each short-term and long-term marketable security when impairment indicators exist with respect to the security. If an other-than-temporary impairment of value of the security exists, the carrying value of the security is written down to its estimated fair value.

Derivatives

The derivatives entered into by the Company are valued using over-the-counter quoted market prices for similar instruments, and are classified within Level 2 of the valuation hierarchy.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Topic 825
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

+ Details

Accounts Receivable

9 Months Ended

Dec. 31, 2011

Accounts Receivable [Abstract]

Accounts Receivable

5. Accounts Receivable

Accounts receivable consisted of the following (in thousands):


		December 31,			March 31,
		2011			2011
Accounts receivable (billed)	$	11,708		$	10,938
Accounts receivable (unbilled)		3,308			5,004
Less: Allowance for doubtful accounts		(252	)		(683	)
Accounts receivable, net	$	14,764		$	15,259

The Company records bank acceptance notes receivable arranged with third-party financial institutions by certain customers to settle their transactions within prepaid expenses and other current assets. These notes are typically non-interest bearing and generally have maturities of less than six months. The carrying amount of notes receivable approximate their fair values. The Company had notes receivable outstanding of $3.2 million and $2.0 million as of December 31, 2011 and March 31, 2011, respectively.

Inventory

9 Months Ended

Dec. 31, 2011

Inventory [Abstract]

Inventory

6. Inventory

The components of inventory are as follows (in thousands):


		December 31,		March 31,
		2011		2011
Raw materials	$	10,279	$	17,100
Work-in-process		4,844		2,432
Finished goods		15,683		3,915
Deferred program costs		3,215		2,381
Net inventory	$	34,021	$	25,828

The Company recorded inventory write-downs of approximately $0.7 million and $2.2 million in the three and nine months ended December 31, 2011, respectively.

Deferred program costs as of December 31, 2011 and March 31 2011 primarily represent costs incurred on D-VAR turnkey projects and programs accounted for under contract accounting where the Company needs to complete development programs before revenue and costs will be recognized.

Product Warranty

9 Months Ended

Dec. 31, 2011

Product Warranty [Abstract]

Product Warranty

7. Product Warranty

The Company generally provides a one to three-year warranty on its products, commencing upon installation. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience.

Product warranty activity was as follows (in thousands):


		Three months ended						Nine months ended
		December 31,						December 31,
		2011			2010			2011			2010
Balance at beginning of period	$	7,055		$	7,374		$	7,907		$	6,431
Change in accruals for warranties during the period		(300	)		2,193			(774	)		6,533
Settlements during the period		(482	)		(1,119	)		(860	)		(4,516	)
Balance at end of period	$	6,273		$	8,448		$	6,273		$	8,448

The Company includes warranty period expirations as changes in accruals for warranties in the table above. The Company includes the warranty accrual within accounts payable and accrued expenses in the unaudited condensed consolidated balance sheets.

Income Taxes	9 Months Ended
Income Taxes	Dec. 31, 2011
Income Taxes [Abstract]
Income Taxes	8. Income Taxes The Company recorded income tax expense of less than $0.1 million and $1.2 million for the three and nine months ended December 31, 2011, respectively, and the Company recorded an income tax benefit of $2.5 million and income tax expense of $12.6 million for the three and nine months ended December 31, 2010, respectively. The Company has provided a valuation allowance against all net deferred tax assets as of December 31, 2011, as it is more likely than not that its net deferred tax assets are not currently realizable due to the net operating losses incurred by the Company since its inception in the U.S., its significant write-offs in the fiscal year ended March 31, 2011 and the losses that are forecasted in certain foreign jurisdictions in the future. During the nine months ended December 31, 2011, the Company recorded additional income tax expense of $0.8 million for uncertain tax positions related to its Austrian subsidiary.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

Restructuring And Impairments

9 Months Ended

Dec. 31, 2011

Restructuring And Impairments [Abstract]

Restructuring And Impairments

9. Restructuring and Impairments

Restructuring

The Company accounts for charges resulting from operational restructuring actions in accordance with ASC Topic 420,

Exit or Disposal Cost Obligations ("ASC 420") and ASC Topic 712, Compensation—Nonretirement Postemployment Benefits

("ASC 712"). In accounting for these obligations, the Company is required to make assumptions related to the amounts of employee severance, benefits, and related costs and the time period over which leased facilities will remain vacant, sublease terms, sublease rates and discount rates. Estimates and assumptions are based on the best information available at the time the obligation arises. These estimates are reviewed and revised as facts and circumstances dictate; changes in these estimates could have a material effect on the amount accrued on the consolidated balance sheet.

The Company initiated restructuring activities in order to reorganize global operations, streamline various functions of the business, and reduce its global workforce to better reflect the demand for its products. From April 1, 2011 through the date of this filing, the Company has reduced its global workforce by approximately 50%, which is expected to generate annualized savings of more than $50 million annually. During the three and nine months ended December 31, 2011, the Company incurred costs associated with the workforce reduction consisting of severance pay, outplacement services, medical benefits, and other related benefits. As a result, for the three and nine months ending December 31, 2011, the Company recorded employee severance and benefit costs of $2.2 million and $5.4 million, respectively. These charges are expected to be paid through the fiscal year ending March 31, 2012.

The following table presents restructuring charges and cash payments (in thousands):


		Severance pay and			Facility
		benefits			exit costs			Total

Accrued restructuring balance at October 1, 2011	$	2,076		$	127		$	2,203
Charges to operations		2,181			-			2,181
Cash payments		(1,647	)		(16	)		(1,663	)
Accrued restructuring balance at December 31, 2011	$	2,610		$	111		$	2,721

Accrued restructuring balance at April 1, 2011	$	-		$	-		$	-
Charges to operations		5,437			127			5,564
Cash payments		(2,827	)		(16	)		(2,843	)
Accrued restructuring balance at December 31, 2011	$	2,610		$	111		$	2,721

In addition, during the nine months ended December 31, 2011 the Company consolidated certain of its business operations in Europe to reduce overall facility costs. The consolidation plan entailed vacating approximately 8,937 square feet of occupied space in Klagenfurt, Austria and plans to vacate approximately 3,300 square feet of occupied space in Nuremburg, Germany. The Klagenfurt facility closure was accounted for in accordance with ASC 420, pursuant to which the Company recorded a liability equal to the fair value of the remaining lease payments as of the cease-use date. Fair value was determined based upon the discounted present value of remaining lease rentals (using a discount rate of 10.1%) for the space no longer occupied, considering future estimated potential sublease income. As a result, the Company recorded facility exit costs of $0.1 million related to the remaining lease commitment on the leased space. These charges are expected to be paid through fiscal 2012. As of December 31, 2011, the Company had not ceased using the Nuremburg facility and therefore recorded no liability for remaining lease payments. All restructuring charges discussed above are included within restructuring and impairments in the Company's unaudited condensed consolidated statements of operations. The Company includes accrued restructuring within accounts payable and accrued expenses in the unaudited condensed consolidated balance sheets.

Impairments

The Company periodically evaluates its long-lived assets consisting principally of fixed assets and amortizable intangible assets for potential impairment. In accordance with the applicable accounting guidance for the treatment of long-lived assets, the Company reviews the carrying value of its long-lived assets or asset group that is held and used, including intangible assets subject to amortization, for impairment whenever events and circumstances indicate that the carrying value of the assets may not be recoverable. Under the held and used approach, the asset or asset group to be tested for impairment should represent the lowest level for which identifiable cash flows are largely independent of the cash flows of other groups of assets and liabilities. The Company evaluates its long-lived assets whenever events or circumstances suggest that the carrying amount of an asset or group of assets may not be recoverable from the estimated undiscounted future cash flows.

In November 2011, the Company completed certain restructuring activities to reduce costs and to align its strategic priorities to capitalize on near and long-term opportunities in its Grid segment. As a result, the Company concluded that there were indicators of potential impairment of certain long-lived assets in its Grid segment and therefore conducted an assessment of the recoverability of these assets during the three months ended December 31, 2011 by comparing the carrying value of the assets to the pre-tax undiscounted cash flows estimated to be generated by those assets over their remaining book useful lives. Based on the calculation performed by management, the sum of the undiscounted cash flows forecasted to be generated by certain assets within its Grid segment were less than the carrying value of those assets. Therefore, there was an indication that certain of the Company's Grid assets were impaired and, as a result, the Company performed additional analysis. An evaluation of the level of impairment was made by comparing the implied fair value of those definite long-lived tangible and intangible assets of its Grid segment against their carrying values.

The fair values of the impacted property and equipment were based on what the Company could reasonably expect to sell each asset from the perspective of a market participant. The determination of the fair value of its property and equipment includes estimates and judgments regarding the marketability and ultimate sales price of individual assets. The Company utilized market data and approximations from comparable analyses to arrive at the estimated fair values of the impacted property and equipment. The fair values of amortization intangible assets related to completed technology were determined

using the relief-from-royalty method over the estimated economic lives of those assets from the perspective of a market participant. During the three months ended December 31, 2011, the Company determined that certain of its Grid segment property, plant and equipment were impaired as their carrying value exceeded their fair value. Accordingly, the Company recorded an impairment charge of $1.7 million.

In addition, the Company recorded impairment charges of $0.2 million and $1.1 million during the three and nine months ended December 31, 2011, respectively, primarily related to long-lived assets for which there is no remaining future economic benefit as a result of the consolidation of operations in Europe.

Commitments And Contingencies	9 Months Ended
Commitments And Contingencies	Dec. 31, 2011
Commitments And Contingencies [Abstract]
Commitments And Contingencies	10. Commitments and Contingencies *Commitments* The Company periodically enters into non-cancelable purchase contracts in order to ensure the availability of materials to support production of its products. Purchase commitments represent enforceable and legally binding agreements with suppliers to purchase goods or services. The Company periodically assesses the need to provide for impairment on these purchase contracts and records a loss on purchase commitments when required. As of December 31, 2011, the Company has $28.8 million of adverse purchase commitments in excess of its estimated future demand from certain of its customers in China, which the Company has recorded as a liability. The Company recorded adverse purchase commitment recoveries of $0.1 million and losses of less than $0.1 million during the three and nine months ended December 31, 2011, respectively. Adverse purchase commitment recoveries in the three months ended December 31, 2011 are the result of reductions in commitments to purchase materials due to renegotiations with certain suppliers and are recorded against cost of revenues. *Contingencies* From time to time, the Company is involved in legal and administrative proceedings and claims of various types. The Company records a liability in its consolidated financial statements for these matters when a loss is known or considered probable and the amount can be reasonably estimated. The Company reviews these estimates each accounting period as additional information is known and adjusts the loss provision when appropriate. If a matter is both probable to result in liability and the amounts of loss can be reasonably estimated, the Company estimates and discloses the possible loss or range of loss. If the loss is not probable or cannot be reasonably estimated, a liability is not recorded in its consolidated financial statements. Between April 6, 2011 and May 12, 2011, seven putative securities class action complaints were filed against the Company and two of its officers in the United States District Court for the District of Massachusetts; one complaint additionally asserted claims against the underwriters who participated in our November 12, 2010 securities offering. On June 7, 2011, the United States District Court for the District of Massachusetts consolidated these actions under the caption Lenartz v. American Superconductor Corporation, et al., Docket No. 1:11-cv-10582-WGY. On August 31, 2011, Lead Plaintiff, the Plumbers and Pipefitters National Pension Fund, filed a consolidated amended complaint against the Company, its officers and directors, and the underwriters who participated in our November 12, 2010 securities offering, asserting claims under sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated under the Securities Exchange Act of 1934, as well as under sections 11, 12(a)(2) and 15 of the Securities Act of 1933. The complaint alleges that during the relevant class period, the Company and its officers omitted to state material facts and made materially false and misleading statements relating to, among other things, its projected and recognized revenues and earnings, as well as its relationship with Sinovel Wind Group Co., Ltd. that artificially inflated the value of the Company's stock price. The complaint further alleges that the Company's November 12, 2010 securities offering contained untrue statements of material facts and omitted to state material facts required to be stated therein. The plaintiffs seek unspecified damages, rescindment of the Company's November 12, 2010 securities offering, and an award of costs and expenses, including attorney's fees. Between May 4, 2011 and June 17, 2011, four putative shareholder derivative complaints were filed against the Company (as a nominal defendant) and certain of its directors in the United States District Court for the District of Massachusetts. On July 5, 2011, the District Court consolidated three of these actions, and that matter is now captioned In re American Superconductor Corporation Derivative Litigation, Docket No. 1:11-cv-10784-WGY. On June 1, 2011, the plaintiff in the fourth action, Marlborough Family Revocable Trust v. Yurek, et al., moved to voluntarily dismiss its complaint and refiled its complaint in Superior Court for the Commonwealth of Massachusetts, Middlesex County. On September 7, 2011, the Marlborough action and another putative shareholder derivative complaint filed in Superior Court for the Commonwealth of Massachusetts were consolidated. That consolidated matter is captioned Marlborough Family Revocable Trust v. Yurek, et al., Docket No. 11-1961. On January 12, 2012, an additional shareholder derivative complaint was filed in the Court of Chancery for the State of Delaware. That matter is captioned Krasnoff v. Budhraja, et al., Docket No. 7171. The allegations of the derivative complaints mirror the allegations made in the putative class action complaints described above. The plaintiffs purport to assert claims against the director defendants for breach of fiduciary duty, abuse of control, gross mismanagement and corporate waste. The plaintiffs seek unspecified damages on behalf of the Company, as well as an award of costs and expenses, including attorney's fees. With respect to the above referenced litigation matters, an estimate of loss or range of loss cannot be made. There are numerous factors that make it difficult to meaningfully estimate possible loss or range of loss at this stage of these litigation matters, including that: the proceedings are in relatively early stages, there are significant factual and legal issues to be resolved, information obtained or rulings made during the lawsuits could affect the methodology for calculation of rescission and the related statutory interest rate. In addition, with respect to claims where damages are the requested relief, no amount of loss or damages has been specified. Therefore, the Company is unable at this time to estimate possible losses. The Company believes that these litigations are without merit, and it intends to defend these actions vigorously. On September 13, 2011, the Company commenced a series of legal actions in China against Sinovel Wind Group Co. Ltd. ("Sinovel"). The Company's Chinese subsidiary, Suzhou AMSC Superconductor Co. Ltd., filed a claim for arbitration with the Beijing Arbitration Commission in accordance with the terms of the Company's supply contracts with Sinovel. The case is captioned (2011) Jin Zhong An Zi No. 0693. On March 31, 2011, Sinovel refused to accept contracted shipments of 1.5 megawatt (MW) and 3 MW wind turbine core electrical components and spare parts that the Company was prepared to deliver. The Company alleges that these actions constitute material breaches of its contracts because Sinovel did not give it notice that it intended to delay deliveries as required under the contracts. Moreover, the Company alleges that Sinovel has refused to pay past due amounts for prior shipments of core electrical components and spare parts. The Company is seeking compensation for past product shipments (including interest) and monetary damages in the amount of approximately RMB 430 million ($67 million) due to Sinovel's breaches of its contracts. The Company is also seeking specific performance of our existing contracts as well as reimbursement of all costs and reasonable expenses with respect to the arbitration. The value of the undelivered components under the existing contracts, including the deliveries refused by Sinovel in March 2011, amounts to approximately RMB 4.6 billion ($720 million). On October 8, 2011, Sinovel filed with the Beijing Arbitration Commission an application under the caption (2011) Jing Zhong An Zi No. 0693, for a counterclaim against the Company for breach of the same contracts under which the Company filed its original arbitration claim. Sinovel claimed, among other things, that the goods supplied by the Company do not conform to the standards specified in the contracts and claimed damages in the amount of approximately RMB 370 million ($58 million). On October 17, 2011, Sinovel filed with the Beijing Arbitration Commission a request for change of counterclaim to increase its damage claim to approximately RMB 1 billion ($157 million). On December 22, 2011, Sinovel filed with the Beijing Arbitration Commission an additional request for change of counterclaim to increase its damages claim to approximately RMB 1.2 billion ($190 million). Deducting the RMB 430 million ($67 million) of past product shipments claimed by the Company, the net amount of damages claimed by Sinovel is approximately RMB 770 million ($120 million). The Company believes that Sinovel's claims are without merit and it intends to defend these actions vigorously. Since the proceedings in this matter are in relatively early stages, the Company cannot reasonably estimate possible losses or range of losses at this time. The Company also submitted a civil action application to the Beijing No. 1 Intermediate People's Court under the caption (2011) Yi Zhong Min Chu Zi No. 15524, against Sinovel for software copyright infringement on September 13, 2011. The application alleges Sinovel's unauthorized use of portions of the Company's wind turbine control software source code developed for Sinovel's 1.5MW wind turbines and the binary code, or upper layer, of the Company's software for the PM3000 power converters in 1.5MW wind turbines. In July 2011, a former employee of the Company's AMSC Windtec GmbH subsidiary was arrested in Austria on charges of economic espionage and fraudulent manipulation of data. In September 2011, the former employee pled guilty to the charges, and he is currently serving a prison sentence. As a result of the Company's internal investigation and a criminal investigation conducted by Austrian authorities, the Company believes that this former employee was contracted by Sinovel through an intermediary while employed by the Company and improperly obtained and transferred to Sinovel portions of its wind turbine control software source code developed for Sinovel's 1.5MW wind turbines. Moreover, the Company believes the former employee illegally used source code to develop for Sinovel a software modification to circumvent the encryption and remove technical protection measures on the PM3000 power converters in 1.5MW wind turbines in the field. The Company is seeking a cease and desist order with respect to the unauthorized copying, installation and use of its software, monetary damages of approximately RMB 38 million ($6 million) for our economic losses and reimbursement of all costs and reasonable expenses. The No. 1 Intermediate People's Court accepted the case, which was necessary in order for the case to proceed. In November 2011, Sinovel filed a motion to remove this case from the Beijing No. 1 Intermediate People's Court and transfer the matter to the Beijing Arbitration Commission. The Company is awaiting the court's decision. The Company submitted a civil action application to the Beijing Higher People's Court against Sinovel and certain of its employees for trade secret infringement on September 13, 2011 under the caption (2011) Gao Min Chu Zi No. 4193. The application alleges the defendants' unauthorized use of portions of the Company's wind turbine control software source code developed for Sinovel's 1.5MW wind turbines as described above with respect to the Copyright Action. The Company is seeking monetary damages of RMB 2.9 billion ($453 million) for the trade secret infringement as well as reimbursement of all costs and reasonable expenses. The Beijing Higher People's Court accepted the case, which was necessary in order for the case to proceed. On December 22, 2011, the Beijing Higher People's Court transferred this case to the Beijing No. 1 Intermediate People's Court under the caption (2011) Gao Min Chu Zi No. 4193. The Company is currently awaiting notice from the Beijing No. 1 Intermediate People's Court regarding the evidence submission deadline and the first hearing date. On September 16, 2011, the Company filed a civil copyright infringement complaint in the Hainan Province No. 1 Intermediate People's Court against Dalian Guotong Electric Co. Ltd. ("Guotong"), a supplier of power converter products to Sinovel, and Huaneng Hainan Power, Inc. ("Huaneng"), a wind farm operator that has purchased Sinovel wind turbines containing Guotong power converter products. The case is captioned (2011) Hainan Yi Zhong Min Chu Zi No. 62. The application alleges that the Company's PM1000 converters in certain Sinovel wind turbines have been replaced by converters produced by Guotong. Because the Guotong converters are being used in wind turbines containing the Company's wind turbine control software, the Company believes that its copyrighted software is being infringed. The Company is seeking a cease and desist order with respect to the unauthorized use of its software, monetary damages of RMB 1.2 million ($0.2 million) for its economic losses (with respect to Guotong only) and reimbursement of all costs and reasonable expenses. The court has accepted the case, which was necessary in order for the case to proceed. In addition, upon the request of the defendant Huaneng, Sinovel has been added by the court to this case as a defendant and Huaneng has been released from this case. In December 2011, Sinovel filed a jurisdiction opposition motion requesting dismissal by the Hainan Province No. 1 Intermediate People's Court, saying the case should be governed by the Beijing Arbitration Commission. On February 3, 2012, the Company received the Civil Ruling from the court, which granted Sinovel's motion, and dismissed the entire case. The Company plans to appeal the court's ruling. Ghodawat Energy Pvt Ltd ("Ghodawat"), a company registered in India carrying on the business of wind power development, lodged a Request for Arbitration with the Secretariat of the ICC International Court of Arbitration on May 12, 2011 and named AMSC Windtec GmbH ("AMSC Windtec") as the Respondent. Under the Request for Arbitration, Ghodawat alleges that AMSC Windtec breached an agreement dated March 19, 2008 pursuant to which AMSC Windtec granted a license to Ghodawat to manufacture, use, sell, market, erect, commission and maintain certain wind turbines using its technical information and wind turbine design (the "License Agreement"). Under the Request for Arbitration, Ghodawat's claims in this arbitration amount to approximately €18 million ($24 million). AMSC Windtec filed an Answer to Request for Arbitration and Counterclaim ("Answer and Counterclaim"), in which AMSC Windtec denied Ghodawat's claims in their entirety. AMSC Windtec has also submitted counterclaims under the License Agreement against Ghodawat in the amount of approximately €6 million ($9 million). Ghodawat has filed a Reply to Answer to Request for Arbitration and Counterclaim in which it denies AMSC Windtec's counterclaims. The arbitration proceedings are currently ongoing. The Company has recorded a loss contingency based on its assessment of probable losses on this claim; however this amount is immaterial to its consolidated financial statements. *Other* The Company enters into long-term construction contracts with customers that require the Company to obtain performance bonds. The Company is required to deposit an amount equivalent to some or all the face amount of the performance bonds into an escrow account until the termination of the bond. When the performance conditions are met, amounts deposited as collateral for the performance bonds are returned to the Company. In addition, the Company has various contractual arrangements in which minimum quantities of goods or services have been committed to be purchased on an annual basis. As of December 31, 2011, the Company had two performance bonds in support of customer contracts. The total value of the outstanding performance bonds was $0.4 million with various expiration dates through October 2012. In the event that the payment is made in accordance with the requirements of any of these performance bonds, the Company would record the payment as an offset to revenue. At December 31, 2011, the Company had $9.0 million of restricted cash included in current assets and $2.5 million of restricted cash included in long-term assets. These amounts included in restricted cash represent deposits to secure letters of credit for various supply contracts. These deposits are held in interest bearing accounts. The Company had unused, unsecured lines of credit consisting of €2.3 million (approximately $3.0 million) in Austria as of December 31, 2011. During the nine months ended December 31, 2011, the Company's unsecured credit line with the Bank of China expired and it repaid borrowings on lines of credit of $4.6 million. There were no borrowings outstanding as of December 31, 2011.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

+ Details

Equity Investments

9 Months Ended

Dec. 31, 2011

Equity Investments [Abstract]

Equity Investments

11. Equity Investments

Investment in Tres Amigas

On October 9, 2009, the Company made an investment in Tres Amigas LLC, a Delaware limited liability company ("Tres Amigas"), is focused on providing the first common interconnection of America's three power grids to help the country achieve its renewable energy goals and facilitate the smooth, reliable and efficient transfer of green power from region to region, for $1.8 million, consisting of $0.8 million in cash and $1.0 million in AMSC common stock. On January 6, 2011 and May 20, 2011, the Company increased its minority position in Tres Amigas by investing an additional $1.8 million in cash on each date. As of December 31, 2011, the Company holds a 34% ownership interest in Tres Amigas

The Company has determined that Tres Amigas is a variable interest entity ("VIE") and that the Company is not the primary beneficiary of the VIE. Therefore, the Company has not consolidated Tres Amigas as of December 31, 2011. The investment is carried at the acquisition cost, plus the Company's equity in undistributed earnings or losses. The Company's maximum exposure to loss is limited to the Company's recorded investment in this VIE. The Company's investment in Tres Amigas is included in other assets on the consolidated balance sheet and the equity in undistributed losses of Tres Amigas is included in other income, net, on the consolidated statements of operations.

The net investment activity for the nine months ended December 31, 2011 is as follows (in thousands):


Balance at April 1, 2011	$	3,026
Purchase of minority investment		1,800
Minority interest in net losses		(741	)
Balance at December 31, 2011	$	4,085

Investment in Blade Dynamics Ltd.

On August 12, 2010, the Company acquired (through its Austrian subsidiary), a minority ownership position in Blade Dynamics Ltd. ("Blade Dynamics"), a designer and manufacturer of advanced wind turbine blades based on proprietary materials and structural technologies, for $8.0 million in cash. The Company uses the equity method of accounting for this investment since it does not have a controlling ownership interest in the operating and financial policies of Blade Dynamics. As such, the investment is carried at the acquisition cost, plus the Company's equity in undistributed earnings or losses. The Company's investment is included in other assets on the unaudited condensed consolidated balance sheets and the minority interest in net losses of Blade Dynamics is included in other income, net, on the unaudited condensed consolidated statements of operations. As of December 31, 2011, the Company holds a 25% ownership interest in Blade Dynamics. The net investment activity for the nine months ended December 31, 2011 is as follows (in thousands):


Balance at April 1, 2011	$	7,903
Minority interest in net losses		(880	)
Net foreign exchange rate impact		(561	)
Balance at December 31, 2011	$	6,462

- Definition

The entire disclosure for equity investment, or group of investments, for which combined disclosure is appropriate, including: (a) the name of each investee and percentage of ownership of common stock, (b) accounting policies for investments in common stock, (c) difference between the amount at which the investment is carried and the amount of underlying equity in net assets and the accounting treatment of the difference, (d) the total fair value of each identified investment for which a market value is available, (e) summarized information as to assets, liabilities, and results of operations of the investees (for investments in unconsolidated subsidiaries, common stock of joint ventures, or other investments using the equity method), and (f) material effects of possible conversions, exercises, or contingent issuances of the investee. Other disclosures include (a) the names of any investee in which the investor owns 20 percent or more of the voting stock and investment is not accounted for using the equity method, and the reasons why not, and (b) the names of any investee in which the investor owns less than 20 percent of the voting stock and the investment is accounted for using the equity method, and the reasons why it is.

+ References + Details

Business Segments

9 Months Ended

Dec. 31, 2011

Business Segments [Abstract]

Business Segments

12. Business Segments

Business segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or decision-making group, in assessing performance and deciding how to allocate resources.

The Company segments its business into two market-facing business units: Wind and Grid. The Company believes this market-centric structure enables it to more effectively anticipate and meet the needs of wind turbine manufacturers, power generation project developers and electric utilities.

Wind. Through its Windtec Solutions, the Wind business segment enables manufacturers to field wind turbines with exceptional power output, reliability and affordability. The Company licenses its highly engineered wind turbine designs, provides extensive customer support services and supplies advanced power electronics and control systems to wind turbine manufactures. The Company's design portfolio includes a broad range of drive trains and power ratings up to 10 megawatts. The Company believes its unique engineering capabilities, ranging from bearings to advanced synchronous generators to blades, enables it to provide its partners with highly-optimized wind turbine platforms. Furthermore, these designs and support services typically lead to sales of its power electronics and software-based control systems, which are designed for optimized performance, efficiency and grid compatibility.
Grid. Through its Gridtec Solutions, the Grid business segment enables electric utilities and renewable energy project developers to connect, transmit and distribute power with exceptional efficiency, reliability and affordability. The Grid business unit provides transmission planning services that allow us to identify power grid congestion, poor power quality and other risks, which helps the Company determine how its solutions can improve network performance. These services often lead to sales of grid interconnection solutions for wind farms and solar power plants, power quality systems and transmission and distribution cable systems.

Prior to April 1, 2011, the Company segmented its operations through two technology-centric business units: AMSC Power Systems and AMSC Superconductors. AMSC Power Systems included all of its Wind products, as well as Grid products that regulate voltage for wind farm voltage electric utilities, renewable generation project developers and industrial operations. Solutions from the Company's AMSC Superconductors business unit have been incorporated into its Grid business unit. All prior period segment disclosures have been revised to conform to management's current view of the Company's business segments.

The operating results for the two business segments are as follows (in thousands):


		Three months ended						Nine months ended
		December 31,						December 31,
		2011	2010			2011				2010

Revenues:
Wind	$	10,125		$	10,840		$	27,836	$	183,162
Grid		7,933			20,730			20,080		43,691
Total	$	18,058		$	31,570		$	47,916	$	226,853


								Nine months ended
		Three months ended						December 31,
		December 31,
		2011			2010			2011			2010
Operating (loss) income:
Wind	($	14,014	)	($	12,494	)	($	54,719	)	$	51,499
Grid		(6,313	)		(8,189	)		(24,511	)		(35,166	)
Unallocated corporate		(6,242	)		(2,277	)		(36,790	)		(10,135	)
expenses
Total	($	26,569	)	($	22,960	)	($	116,020	)	$	6,198

The accounting policies of the business segments are the same as those for the consolidated Company. The Company's business segments have been determined in accordance with the Company's internal management structure, which is organized based on operating activities. The Company evaluates performance based upon several factors, of which the primary financial measures are segment revenues and segment operating (loss) income. The disaggregated financial results of the segments reflect allocation of certain functional expense categories consistent with the basis and manner in which Company management

internally disaggregates financial information for the purpose of assisting in making internal operating decisions. In addition, certain corporate expenses which the Company does not believe are specifically attributable or allocable to either of the two business segments have been excluded from the segment operating (loss) income.

For the three and nine months ended December 31, 2011, unallocated corporate expenses primarily consist of restructuring and impairment charges of $4.1 million and $8.4 million, respectively, and stock-based compensation expense of $2.1 million and $7.7 million, respectively. In addition, the nine months ended December 31, 2011 includes expense of $20.6 million for the write-off of an advanced payment to The Switch. Unallocated corporate expenses primarily consist of stock-based compensation expense of $2.2 million and $10.1 million for the three and nine months ended December 31, 2010, respectively.

Total assets for the two business segments are as follows (in thousands):


		December 31,		March 31,
		2011		2011
Wind	$	89,370	$	145,464
Grid		70,285		67,081
Corporate assets		115,708		228,664
Total	$	275,363	$	441,209

The following table sets forth customers who represented 10% or more of the Company's total revenues:


		Three months ended						Nine months ended
		December 31,						December 31,
		2011			2010			2011			2010
Inox Wind, Ltd.		27	%	<	10	%		21	%	<	10	%
Doosan Heavy Industries & Construction Co Ltd.		12	%	<	10	%		15	%	<	10	%
Ergon Energy Corporation Limited		11	%		—		<	10	%		—
Vestas – Australian Wind Technology Ltd	<	10	%		44	%	<	10	%	<	10	%
Hyundai Heavy Industries Co., Ltd.	<	10	%		10	%	<	10	%	<	10	%
Shenyang Blower Works Group Co., Ltd.	<	10	%		11	%	<	10	%	<	10	%
Sinovel Wind Co., Ltd		—			—			—			66	%

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
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-Paragraph 40
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
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-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

+ Details

Recent Accounting Pronouncements	9 Months Ended
Recent Accounting Pronouncements	Dec. 31, 2011
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	13. Recent Accounting Pronouncements In December 2010, the FASB issued Accounting Standards Update (ASU) No. 2010-29, Business Combinations (Topic 805), Disclosure of Supplementary Pro forma Information for Business Combinations a consensus of the FASB Emerging Issues Task Force (ASC 2010-29). This amendment clarifies the periods for which pro forma financial information is presented. The disclosures include pro forma revenue and earnings of the combined entity for the current reporting period as though the acquisition date for all business combinations that occurred during the year had been as of the beginning of the annual reporting period. If comparative financial statements are presented, the pro forma revenue and earnings of the combined entity for the comparable prior reporting period should be reported as though the acquisition date for all business combinations that occurred during the current year had been as of the beginning of the comparable prior annual reporting period. ASU 2010-29 is effective prospectively for business combinations that occur on or after the beginning of the first annual reporting period beginning after December 15, 2010. The adoption of ASU 2010-29 did not have a material impact on the Company's consolidated results of operations, financial condition, or cash flows. In June 2011, the FASB issued Accounting Standards Update (ASU) No. 2011-05, Comprehensive Income (Topic 220): Presentation of Comprehensive Income. ASU 2011-05 requires entities to present net income and other comprehensive income in either a single continuous statement or in two separate, but consecutive, statements of net income and other comprehensive income. ASU 2011-05 is effective for fiscal years and interim periods beginning after December 15, 2011. The Company does not expect the adoption of ASU 2011-05 to have a material impact on the Company's consolidated results of operations, financial condition, or cash flows.

Subsequent Events	9 Months Ended
Subsequent Events	Dec. 31, 2011
Subsequent Events [Abstract]
Subsequent Events	14. Subsequent Events The Company has performed an evaluation of subsequent events through the time of filing this Quarterly Report on Form 10-Q with the SEC, and has determined that there are no such events that are required to be disclosed.

Recent Accounting Pronouncements (Policy)	9 Months Ended
Recent Accounting Pronouncements (Policy)	Dec. 31, 2011
Recent Accounting Pronouncements [Abstract]
Business Combinations	In December 2010, the FASB issued Accounting Standards Update (ASU) No. 2010-29, Business Combinations (Topic 805), Disclosure of Supplementary Pro forma Information for Business Combinations a consensus of the FASB Emerging Issues Task Force (ASC 2010-29). This amendment clarifies the periods for which pro forma financial information is presented. The disclosures include pro forma revenue and earnings of the combined entity for the current reporting period as though the acquisition date for all business combinations that occurred during the year had been as of the beginning of the annual reporting period. If comparative financial statements are presented, the pro forma revenue and earnings of the combined entity for the comparable prior reporting period should be reported as though the acquisition date for all business combinations that occurred during the current year had been as of the beginning of the comparable prior annual reporting period. ASU 2010-29 is effective prospectively for business combinations that occur on or after the beginning of the first annual reporting period beginning after December 15, 2010. The adoption of ASU 2010-29 did not have a material impact on the Company's consolidated results of operations, financial condition, or cash flows.
Comprehensive Income	In June 2011, the FASB issued Accounting Standards Update (ASU) No. 2011-05, Comprehensive Income (Topic 220): Presentation of Comprehensive Income. ASU 2011-05 requires entities to present net income and other comprehensive income in either a single continuous statement or in two separate, but consecutive, statements of net income and other comprehensive income. ASU 2011-05 is effective for fiscal years and interim periods beginning after December 15, 2011. The Company does not expect the adoption of ASU 2011-05 to have a material impact on the Company's consolidated results of operations, financial condition, or cash flows.

Stock-Based Compensation (Tables)

9 Months Ended

Dec. 31, 2011

Stock-Based Compensation [Abstract]

Summary Of Stock-Based Compensation Expense By Financial Statement Line Item


		Three months ended					Nine months ended
		December 31,					December 31,
		2011		2010			2011		2010
Cost of revenues	$	138	$	(6	)	$	908	$	828
Research and development		623		237			1,948		1,396
Selling, general and administrative		1,357		2,017			4,841		7,849
Total	$	2,118	$	2,248		$	7,697	$	10,073

Schedule Of Weighted-Average Assumptions Used In The Black-Scholes Valuation Model For Stock Options Granted


	Three months ended				Nine months ended
	December 31,				December 31,
	2011		2010		2011		2010
Expected volatility	79.7	%	61.4	%	69.7	%	65.5	%
Risk-free interest rate	1.1	%	2.4	%	1.8	%	2.1	%
Expected life (years)	5.9		6.1		5.9		6.1
Dividend yield	None		None		None		None

Computation Of Net (Loss) Income Per Common Share (Tables)

9 Months Ended

Dec. 31, 2011

Computation Of Net (Loss) Income Per Common Share [Abstract]

Schedule Of Earnings Per Share Calculation


		Three months ended						Nine months ended
		December 31,						December 31,
		2011			2010			2011			2010
Numerator:

Net loss	$	(26,271	)	$	(18,158	)	$	(115,660	)	$	(1,150	)

Denominator:
Weighted-average shares of common stock outstanding		51,459			48,731			51,120			46,667
Weighted-average shares subject to repurchase		(526	)		(663	)		(331	)		(650	)

Shares used in per-share calculation basic		50,933			48,068			50,789			46,017

Shares used in per-share calculation diluted		50,933			48,068			50,789			46,017

Net loss per share basic	$	(0.52	)	$	(0.38	)	$	(2.28	)	$	(0.02	)

Net loss per share diluted	$	(0.52	)	$	(0.38	)	$	(2.28	)	$	(0.02	)

Fair Value Measurements (Tables)

9 Months Ended

12 Months Ended

Dec. 31, 2011

Mar. 31, 2011

Fair Value Measurements [Abstract]

Schedule Of Assets Carried At Fair Value


		Total		Quoted Prices in		Using Significant Other		Using Significant
		Carrying		Active Markets		Observable Inputs		Unobservable Inputs
		Value		(Level 1)		(Level 2)		(Level 3)
December 31, 2011:
Assets:
Cash equivalents	$	38,474	$	38,474	$	—	$	—
Short-term commercial paper		5,261		—		5,261		—



		Total		Quoted Prices in		Using Significant Other		Using Significant
		Carrying		Active Markets		Observable Inputs		Unobservable Inputs
		Value		(Level 1)		(Level 2)		(Level 3)
March 31, 2011:
Assets:
Cash equivalents	$	49,837	$	49,837	$	—	$	—
Short-term government-backed		76,371		—		76,371		—
securities
Short-term commercial paper		39,755		—		39,755		—
Derivatives		3,087		—		3,087		—

- Definition

Tabular disclosure of the total amount of gains or losses for the period which are included in earnings or resulted in a change to net assets which gains or losses have arisen from the use of significant unobservable inputs (Level 3) to measure the fair value of assets and liabilities. Such gains or losses are attributable to the change in unrealized gains or losses relating to those assets and liabilities so valued which are still held at the reporting date and which change are also considered for disclosure; it may be expected that a description of where those unrealized gains or losses are reported in the statement of income or the statement of financial position would also be disclosed.

+ References + Details

Accounts Receivable (Tables)

9 Months Ended

Dec. 31, 2011

Accounts Receivable [Abstract]

Schedule Of Accounts Receivable


		December 31,			March 31,
		2011			2011
Accounts receivable (billed)	$	11,708		$	10,938
Accounts receivable (unbilled)		3,308			5,004
Less: Allowance for doubtful accounts		(252	)		(683	)
Accounts receivable, net	$	14,764		$	15,259

Inventory (Tables)

9 Months Ended

Dec. 31, 2011

Inventory [Abstract]

Components Of Inventory


		December 31,		March 31,
		2011		2011
Raw materials	$	10,279	$	17,100
Work-in-process		4,844		2,432
Finished goods		15,683		3,915
Deferred program costs		3,215		2,381
Net inventory	$	34,021	$	25,828

Product Warranty (Tables)

9 Months Ended

Dec. 31, 2011

Product Warranty [Abstract]

Schedule Of Product Warranty Activity


		Three months ended						Nine months ended
		December 31,						December 31,
		2011			2010			2011			2010
Balance at beginning of period	$	7,055		$	7,374		$	7,907		$	6,431
Change in accruals for warranties during the period		(300	)		2,193			(774	)		6,533
Settlements during the period		(482	)		(1,119	)		(860	)		(4,516	)
Balance at end of period	$	6,273		$	8,448		$	6,273		$	8,448

Restructuring And Impairments (Tables)

9 Months Ended

Dec. 31, 2011

Restructuring And Impairments [Abstract]

Schedule Of Restructuring Charges And Cash Payments


		Severance pay and			Facility
		benefits			exit costs			Total

Accrued restructuring balance at October 1, 2011	$	2,076		$	127		$	2,203
Charges to operations		2,181			-			2,181
Cash payments		(1,647	)		(16	)		(1,663	)
Accrued restructuring balance at December 31, 2011	$	2,610		$	111		$	2,721

Accrued restructuring balance at April 1, 2011	$	-		$	-		$	-
Charges to operations		5,437			127			5,564
Cash payments		(2,827	)		(16	)		(2,843	)
Accrued restructuring balance at December 31, 2011	$	2,610		$	111		$	2,721

Equity Investments (Tables)

9 Months Ended

Dec. 31, 2011

Tres Amigas [Member]

Schedule of Equity Method Investments [Line Items]

Schedule Of Net Investment Activity


Balance at April 1, 2011	$	3,026
Purchase of minority investment		1,800
Minority interest in net losses		(741	)
Balance at December 31, 2011	$	4,085

Blade Dynamics Ltd. [Member]

Schedule of Equity Method Investments [Line Items]

Schedule Of Net Investment Activity


Balance at April 1, 2011	$	7,903
Minority interest in net losses		(880	)
Net foreign exchange rate impact		(561	)
Balance at December 31, 2011	$	6,462

Business Segments (Tables)

9 Months Ended

Dec. 31, 2011

Business Segments [Abstract]

Schedule Of Business Segments Operating Results


		Three months ended						Nine months ended
		December 31,						December 31,
		2011	2010			2011				2010

Revenues:
Wind	$	10,125		$	10,840		$	27,836	$	183,162
Grid		7,933			20,730			20,080		43,691
Total	$	18,058		$	31,570		$	47,916	$	226,853


								Nine months ended
		Three months ended						December 31,
		December 31,
		2011			2010			2011			2010
Operating (loss) income:
Wind	($	14,014	)	($	12,494	)	($	54,719	)	$	51,499
Grid		(6,313	)		(8,189	)		(24,511	)		(35,166	)
Unallocated corporate		(6,242	)		(2,277	)		(36,790	)		(10,135	)
expenses
Total	($	26,569	)	($	22,960	)	($	116,020	)	$	6,198

Schedule Of Business Segments Assets


		December 31,		March 31,
		2011		2011
Wind	$	89,370	$	145,464
Grid		70,285		67,081
Corporate assets		115,708		228,664
Total	$	275,363	$	441,209

Schedule Of Customers Who Represented 10% Or More Of The Company's Total Revenues


		Three months ended						Nine months ended
		December 31,						December 31,
		2011			2010			2011			2010
Inox Wind, Ltd.		27	%	<	10	%		21	%	<	10	%
Doosan Heavy Industries & Construction Co Ltd.		12	%	<	10	%		15	%	<	10	%
Ergon Energy Corporation Limited		11	%		—		<	10	%		—
Vestas – Australian Wind Technology Ltd	<	10	%		44	%	<	10	%	<	10	%
Hyundai Heavy Industries Co., Ltd.	<	10	%		10	%	<	10	%	<	10	%
Shenyang Blower Works Group Co., Ltd.	<	10	%		11	%	<	10	%	<	10	%
Sinovel Wind Co., Ltd		—			—			—			66	%

Description Of The Business And Basis Of Presentation (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2011 USD ($) mW	Dec. 31, 2010 USD ($)	Mar. 31, 2011 USD ($)
Entity-Wide Information, Revenue from External Customer [Line Items]
Maximum range of drive trains and power ratings (in megawatts) \| mW			10
Cash, cash equivalents, and marketable securities	$ 63,900		$ 63,900
Net loss	26,271	$ 18,158	115,660	$ 1,150
Adverse purchase commitments for inventory	$ 28,763		$ 28,763		$ 38,763
Headcount reduced due to restructuring activities, percentage of work force			50.00%
Expected annual savings due to workforce reduction			$ 50,000
Number of workforce persons, minimum	400		400
Loss On Long-Term Purchase Commitment [Member]
Entity-Wide Information, Revenue from External Customer [Line Items]
Write-off of an advance payment			$ 20,600

Stock-Based Compensation (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2011 USD ($) shares	Dec. 31, 2010 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-based restricted stock granted in period \| shares			109,000
Shares granted vesting period, years			three
Stock-based compensation expense	$ 2,118	$ 2,248	$ 7,697	$ 10,073
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, stock grants in period \| shares			815,000
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures	7,400		$ 7,400
Period over which unrecognized compensation expense is expected to be recognized (years)			2.1
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, stock grants in period \| shares			408,000
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures	$ 4,000		$ 4,000
Period over which unrecognized compensation expense is expected to be recognized (years)			1.7
Former Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 900
Minimum [Member] \| U.S. Treasury Rates [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average time period taken in calculating risk-free interest rate, years			5
Maximum [Member] \| U.S. Treasury Rates [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average time period taken in calculating risk-free interest rate, years			7

Stock-Based Compensation (Summary Of Stock-Based Compensation Expense By Financial Statement Line Item) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Component of Operating Other Cost and Expense [Line Items]
Stock-based compensation expense	$ 2,118	$ 2,248	$ 7,697	$ 10,073
Cost Of Revenues [Member]
Component of Operating Other Cost and Expense [Line Items]
Stock-based compensation expense	138	(6)	908	828
Research And Development [Member]
Component of Operating Other Cost and Expense [Line Items]
Stock-based compensation expense	623	237	1,948	1,396
Selling, General And Administrative [Member]
Component of Operating Other Cost and Expense [Line Items]
Stock-based compensation expense	$ 1,357	$ 2,017	$ 4,841	$ 7,849

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References + Details

Stock-Based Compensation (Schedule Of Weighted-Average Assumptions Used In The Black-Scholes Valuation Model For Stock Options Granted) (Details)	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Stock-Based Compensation [Abstract]
Expected volatility	79.70%	61.40%	69.70%	65.50%
Risk-free interest rate	1.10%	2.40%	1.80%	2.10%
Expected life (years)	5.9	6.1	5.9	6.1
Dividend yield	None	None	None	None

Computation Of Net (Loss) Income Per Common Share (Schedule Of Earnings Per Share Calculation) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Computation Of Net (Loss) Income Per Common Share [Abstract]
Net loss	$ (26,271)	$ (18,158)	$ (115,660)	$ (1,150)
Weighted-average shares of common stock outstanding	51,459	48,731	51,120	46,667
Weighted-average shares subject to repurchase	(526)	(663)	(331)	(650)
Shares used in per-share calculation basic	50,933	48,068	50,789	46,017
Shares used in per-share calculation diluted	50,933	48,068	50,789	46,017
Net loss per share basic	$ (0.52)	$ (0.38)	$ (2.28)	$ (0.02)
Net loss per share diluted	$ (0.52)	$ (0.38)	$ (2.28)	$ (0.02)
Anti-dilutive shares excluded from calculation of diluted EPS	2,400	2,400	2,000	2,000

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 20

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 7
-Paragraph 18

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.23)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1448-109256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2011	Mar. 31, 2011
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash equivalents	$ 38,474	$ 49,837
Short-term government-backed securities		76,371
Short-term commercial paper	5,261	39,755
Derivatives		3,087
Transfers of assets and liabilities between Level 1 and Level 2	0
Quoted Prices In Active Markets (Level 1) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash equivalents	38,474	49,837
Using Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Short-term government-backed securities		76,371
Short-term commercial paper	$ 5,261	39,755
Derivatives		$ 3,087

- Definition

Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash equivalents may be reported as cash equivalents, while legally restricted equivalents held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular equivalents are not generally reported as part of unrestricted cash equivalents.

+ References + Details

- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References + Details

Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2011	Mar. 31, 2011
Accounts Receivable [Abstract]
Accounts receivable (billed)	$ 11,708	$ 10,938
Accounts receivable (unbilled)	3,308	5,004
Less: Allowance for doubtful accounts	(252)	(683)
Accounts receivable, net	14,764	15,259
Notes receivable outstanding	$ 3,200	$ 2,000

Inventory (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2011
Inventory [Abstract]
Raw materials	$ 10,279	$ 10,279		$ 17,100
Work-in-process	4,844	4,844		2,432
Finished goods	15,683	15,683		3,915
Deferred program costs	3,215	3,215		2,381
Net inventory	34,021	34,021		$ 25,828
Inventory write-downs	$ 700	$ 2,150	$ 2,667

- Definition

Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

+ References + Details

Product Warranty (Details) $ in Thousands	3 Months Ended		9 Months Ended
Product Warranty (Details) $ in Thousands	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)
Product Warranty [Line Items]
Balance at beginning of period	$ 7,055	$ 7,374	$ 7,907	$ 6,431
Change in accruals for warranties during the period	(300)	2,193	(774)	6,533
Settlements during the period	(482)	(1,119)	(860)	(4,516)
Balance at end of period	$ 6,273	$ 8,448	$ 6,273	$ 8,448
Minimum [Member]
Product Warranty [Line Items]
Warranty period, in years			1
Maximum [Member]
Product Warranty [Line Items]
Warranty period, in years			3

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Income tax expense (benefit)	$ 84	$ (2,495)	$ 1,185	$ 12,642
Additional income tax expense			$ 800

- Definition

The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable Income or Loss from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

+ Details

Restructuring And Impairments (Narrative) (Details) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2011 USD ($) sqft
Restructuring And Impairments [Abstract]
Headcount reduced due to restructuring activities, percentage of work force		50.00%
Expected annual savings due to workforce reduction		$ 50.0
Employee severance and benefit costs	$ 2.2	$ 5.4
Space to be vacated, Kalagenfurt, square feet		8,937
Space to be vacated, Nuremburg, square feet \| sqft		3,300
Lease rentals discount rate		10.10%
Facility exit costs		$ 0.1
Impairment charge	1.7
Impairment charges of long-lived assets for which there is no remaining future economic benefit	$ 0.2	$ 1.1

Restructuring And Impairments (Schedule Of Restructuring Charges And Cash Payments) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2011	Dec. 31, 2011
Restructuring and Related Cost [Line Items]
Accrued restructuring beginning balance	$ 2,203
Charges to operations	2,181	5,564
Cash payments	(1,663)	(2,843)
Accrued restructuring ending balance	2,721	2,721
Severance Pay And Benefits [Member]
Restructuring and Related Cost [Line Items]
Accrued restructuring beginning balance	2,076
Charges to operations	2,181	5,437
Cash payments	(1,647)	(2,827)
Accrued restructuring ending balance	2,610	2,610
Facility Exit Costs [Member]
Restructuring and Related Cost [Line Items]
Accrued restructuring beginning balance	127
Charges to operations		127
Cash payments	(16)	(16)
Accrued restructuring ending balance	$ 111	$ 111

Commitments And Contingencies (Details) € in Millions, ¥ in Millions																			1 Months Ended		3 Months Ended	9 Months Ended
	Dec. 22, 2011 CNY (¥)	Dec. 22, 2011 USD ($)	Dec. 22, 2011 CNY (¥)	Dec. 22, 2011 USD ($)	Dec. 22, 2011 CNY (¥)	Dec. 22, 2011 USD ($)	Oct. 17, 2011 CNY (¥)	Oct. 17, 2011 USD ($)	Oct. 08, 2011 CNY (¥)	Oct. 08, 2011 USD ($)	Sep. 16, 2011 CNY (¥)	Sep. 16, 2011 USD ($)	Sep. 13, 2011 CNY (¥)	Sep. 13, 2011 USD ($)	May 12, 2011 EUR (€)	May 12, 2011 USD ($)	Mar. 31, 2011 CNY (¥)	Mar. 31, 2011 USD ($)	Jun. 17, 2011	May 12, 2011	Dec. 31, 2011 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2011 EUR (€)	Dec. 31, 2011 USD ($)	Mar. 31, 2011 USD ($)
Commitments And Contingencies [Line Items]
Adverse purchase commitments included in purchase commitment																								$ 28,800,000
Adverse purchase commitment recoveries (losses)																					$ 100,000	$ (100,000)
Number of putative securities complaints																			4	7
Number of officers putative securities filed against																				2
Number of outstanding performance bonds																						2
Total value of outstanding performance bonds																						$ 400,000
Performance bond latest expiration date																						October 2012
Restricted cash included in current assets																								9,000,000
Restricted cash included in long-term assets																								2,540,000
Net borrowings on lines of credit outstanding																								0
Lines of credit facility repaid																						$ 4,600,000
Chinese Yen Line Of Credit [Member]
Commitments And Contingencies [Line Items]
Unused, unsecured lines of credit \| €																							€ 2.3
Euro Line Of Credit [Member]
Commitments And Contingencies [Line Items]
Unused, unsecured lines of credit																								$ 3,000,000
Sinovel Wind Group Co. Ltd. [Member]
Commitments And Contingencies [Line Items]
Claim amount per request for arbitration			¥ 1,200.0	$ 190,000,000			¥ 1,000.0	$ 157,000,000	¥ 370.0	$ 58,000,000
Monetary damages due to breaches of contracts																	¥ 430.0	$ 67,000,000
Value of the undelivered components																	¥ 4,600.0								$ 720,000,000
Net amount of damages claimed	¥ 430.0	$ 67,000,000			¥ 770.0	$ 120,000,000
Damages claimed for unauthorized use of software													¥ 38.0	$ 6,000,000
Monetary damages for trade secret infringement													¥ 2,900.0	$ 453,000,000
Dalian Guotong Electric Co. Ltd. [Member]
Commitments And Contingencies [Line Items]
Damages claimed for unauthorized use of software											¥ 1.2	$ 200,000
AMSC Windtec [Member]
Commitments And Contingencies [Line Items]
Claim amount per request for arbitration															€ 18.0	$ 24,000,000
Counterclaim under License Agreement															€ 6.0	$ 9,000,000

Equity Investments (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2011	May 20, 2011	Jan. 06, 2011	Aug. 12, 2010	Oct. 09, 2009
Tres Amigas [Member]
Schedule of Equity Method Investments [Line Items]
Acquisition date	October 9, 2009
Equity method investment, aggregate cost					$ 1.8
Equity method investment in cash					0.8
Equity method investment in common stock					$ 1.0
Cash consideration for increase in minority position		$ 1.8	$ 1.8
Equity method investment ownership percentage	34.00%
Blade Dynamics Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Acquisition date	August 12, 2010
Equity method investment in cash				$ 8.0
Equity method investment ownership percentage	25.00%

- Definition

Month, date and year in which the acquirer obtains control of the acquiree.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 3
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 10, 11
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6909708&loc=d3e848-128460

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1392-128463

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6909708&loc=d3e845-128460

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Acquisition Date
-URI http://asc.fasb.org/extlink&oid=6919109

+ Details

Equity Investments (Schedule Of Net Investment Activity) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Net foreign exchange rate impact	$ (1,157)	$ (5,386)	$ (2,264)	$ (1,215)
Blade Dynamics Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Balance at April 1, 2011			7,903
Minority interest in net losses			(880)
Net foreign exchange rate impact			(561)
Balance at December 31, 2011	6,462		6,462
Tres Amigas [Member]
Schedule of Equity Method Investments [Line Items]
Balance at April 1, 2011			3,026
Purchase of minority investment	1,800		1,800
Minority interest in net losses			(741)
Balance at December 31, 2011	$ 4,085		$ 4,085

- Definition

The portion of net Income or Loss attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A1, A4, A5
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4K
-URI http://asc.fasb.org/extlink&oid=6922042&loc=SL4591552-111686

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6921930&loc=SL4573702-111684

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=6922042&loc=SL4591551-111686

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity, net of tax.

+ References

+ Details

Business Segments (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
Business Segments (Narrative) (Details) $ in Thousands	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2011 USD ($) mW	Dec. 31, 2010 USD ($)
Segment Reporting Information [Line Items]
Stock-based compensation expense	$ 2,118	$ 2,248	$ 7,697	$ 10,073
Maximum range of drive trains and power ratings (in megawatts) \| mW			10
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Advance payment to The Switch			$ 20,600
Restructuring costs and asset impairment charges	4,100		8,400
Stock-based compensation expense	$ 2,100	$ 2,200	$ 7,700	$ 10,100

- Definition

+ References + Details

Business Segments (Schedule Of Business Segments Operating Results) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenues	$ 18,058	$ 31,570	$ 47,916	$ 226,853
Operating (loss) income	(26,569)	(22,960)	(116,020)	6,198
Wind [Member]
Segment Reporting Information [Line Items]
Revenues	10,125	10,840	27,836	183,162
Operating (loss) income	(14,014)	(12,494)	(54,719)	51,499
Grid [Member]
Segment Reporting Information [Line Items]
Revenues	7,933	20,730	20,080	43,691
Operating (loss) income	(6,313)	(8,189)	(24,511)	(35,166)
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating (loss) income	$ (6,242)	$ (2,277)	$ (36,790)	$ (10,135)

Business Segments (Schedule Of Business Segments Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2011	Mar. 31, 2011
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 275,363	$ 441,209
Wind [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	89,370	145,464
Grid [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	70,285	67,081
Corporate Assets [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 115,708	$ 228,664

Business Segments (Schedule Of Customers Who Represented 10% Or More Of The Company's Total Revenues) (Details)	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Inox Wind, Ltd. [Member]
Entity-Wide Revenue, Major Customer [Line Items]
Revenue, percentage	27.00%	10.00%	21.00%	10.00%
Doosan Heavy Industries & Construction Co Ltd. [Member]
Entity-Wide Revenue, Major Customer [Line Items]
Revenue, percentage	12.00%	10.00%	15.00%	10.00%
Ergon Energy Corporation Limited [Member]
Entity-Wide Revenue, Major Customer [Line Items]
Revenue, percentage	11.00%		10.00%
Vestas - Australian Wind Technology Ltd [Member]
Entity-Wide Revenue, Major Customer [Line Items]
Revenue, percentage	10.00%	44.00%	10.00%	10.00%
Hyundai Heavy Industries Co., Ltd. [Member]
Entity-Wide Revenue, Major Customer [Line Items]
Revenue, percentage	10.00%	10.00%	10.00%	10.00%
Shenyang Blower Works Group Co., Ltd. [Member]
Entity-Wide Revenue, Major Customer [Line Items]
Revenue, percentage	10.00%	11.00%	10.00%	10.00%
Sinovel Wind Co., Ltd [Member]
Entity-Wide Revenue, Major Customer [Line Items]
Revenue, percentage				66.00%