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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Jun. 30, 2010	Aug. 02, 2010
Statement [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2010
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q1
Entity Registrant Name	AMERICAN SUPERCONDUCTOR CORP /DE/
Entity Central Index Key	0000880807
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		45,554,877

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2010	Mar. 31, 2010
ASSETS
Cash and cash equivalents	$ 64,844	$ 87,594
Marketable securities	44,632	54,469
Accounts receivable, net	90,212	62,203
Inventory	41,022	35,858
Prepaid expenses and other current assets	16,315	15,381
Restricted cash	5,265	5,713
Deferred tax assets	2,022	1,776
Total current assets	264,312	262,994
Property, plant and equipment, net	70,191	64,315
Goodwill	37,934	36,696
Intangibles, net	8,016	7,770
Marketable securities	5,961	7,342
Deferred tax assets	3,652	3,043
Other assets	19,967	18,024
Total assets	410,033	400,184
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	79,113	84,319
Deferred revenue	25,272	19,970
Deferred tax liabilities	3,360	471
Total current liabilities	107,745	104,760
Non-current liabilities
Deferred revenue	15,241	13,302
Deferred tax liabilities	660	777
Other	422	380
Total liabilities	$ 124,068	$ 119,219
Commitments and contingencies (Note 8)
Stockholders' equity:
Common stock	$ 455	$ 448
Additional paid-in capital	706,741	698,417
Accumulated other comprehensive loss	(19,512)	(7,011)
Accumulated deficit	(401,719)	(410,889)
Total stockholders' equity	285,965	280,965
Total liabilities and stockholders' equity	$ 410,033	$ 400,184

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2010	Jun. 30, 2009
Statement [Line Items]
Revenues	$ 97,209	$ 73,000
Cost and operating expenses:
Cost of revenues	58,224	50,417
Research and development	7,335	4,528
Selling, general and administrative	15,183	10,885
Amortization of acquisition related intangibles	386	445
Restructuring and impairments		334
Total cost and operating expenses	81,128	66,609
Operating income	16,081	6,391
Interest income	175	243
Other income (expense), net	171	(1,976)
Income before income tax expense	16,427	4,658
Income tax expense	7,257	2,866
Net income	$ 9,170	$ 1,792
Net income per common share
Basic	$ 0.2	$ 0.04
Diluted	$ 0.2	$ 0.04
Weighted average number of common shares outstanding
Basic	45,242	43,789
Diluted	45,983	44,533

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2010	Jun. 30, 2009
Statement [Line Items]
Net income	$ 9,170	$ 1,792
Other comprehensive income (loss)
Foreign currency translation gain (loss)	(12,336)	4,057
Unrealized losses on investments	(165)	(90)
Other comprehensive income (loss)	(12,501)	3,967
Comprehensive income (loss)	$ (3,331)	$ 5,759

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2010	Jun. 30, 2009
Cash flows from operating activities:
Net income	$ 9,170	$ 1,792
Adjustments to reconcile net income to net cash used in operations:
Depreciation and amortization	2,654	2,301
Stock-based compensation expense	3,499	3,066
Stock-based compensation expense-non-employee	79	30
Allowance for doubtful accounts	957	(657)
Deferred income taxes	2,027	(707)
Other non-cash items	320	207
Changes in operating asset and liability accounts:
Accounts receivable	(35,848)	(13,068)
Inventory	(5,654)	3,903
Prepaid expenses and other current assets	(1,616)	513
Accounts payable and accrued expenses	(2,140)	(10,176)
Deferred revenue	8,073	(1,340)
Net cash used in operating activities	(18,479)	(14,136)
Cash flows from investing activities:
Purchase of property, plant and equipment	(8,185)	(1,660)
Purchase of marketable securities	(15,061)	(12,441)
Proceeds from the maturity of marketable securities	24,189	23,008
Change in restricted cash	257	(399)
Purchase of intangible assets	(1,230)	(369)
Change in other assets	(11)	(427)
Net cash provided by (used in) investing activities	(41)	7,712
Cash flows from financing activities:
Proceeds from exercise of employee stock options and ESPP	561	1,494
Net cash provided by financing activities	561	1,494
Effect of exchange rate changes on cash and cash equivalents	(4,791)	1,039
Net decrease in cash and cash equivalents	(22,750)	(3,891)
Cash and cash equivalents at beginning of the period	87,594	70,674
Cash and cash equivalents at end of the period	64,844	66,783
Supplemental schedule of cash flow information:
Non-cash issuance of common stock	189	169
Non-cash contingent consideration in connection with acquisitions	4,004	3,281
Cash paid for income taxes	$ 4,453	$ 2,195

Description of the Business and Basis of Presentation	3 Months Ended
Description of the Business and Basis of Presentation	Jun. 30, 2010
Statement [Line Items]
Description of the Business and Basis of Presentation	1. Description of the Business and Basis of Presentation American Superconductor Corporation (the "Company" or "AMSC") was founded on April 9, 1987. The Company offers an array of proprietary technologies and solutions spanning the electric power infrastructure - from generation to delivery to end use. The Company is a leader in renewable energy, providing proven, megawatt-scale wind turbine designs and electrical control systems. The Company also offers a host of Smart Grid technologies for power grid operators that enhance the reliability, efficiency and capacity of the power grid, and seamlessly integrate renewable energy sources into the power infrastructure. These technologies include superconductor power cable systems, grid-level surge protectors and power electronics-based voltage stabilization systems. The Company operates in two business segments: AMSC Power Systems and AMSC Superconductors. 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 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 generally accepted accounting principles in the United States of America. 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 June 30, 2010 and 2009 and the financial position at June 30, 2010. 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. 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, 2010 (fiscal 2009) which are contained in the Company's Annual Report on Form 10-K, filed with the SEC on May 27, 2010. New Accounting Pronouncements In September 2009, the Emerging Issues Task Force issued new rules pertaining to the accounting for revenue arrangements with multiple deliverables. The new rules provide an alternative method for establishing fair value of a deliverable when vendor specific objective evidence or third party evidence cannot be determined. The rules provide for the determination of the best estimate of selling price for separate deliverables and allows for the allocation of arrangement consideration using this relative selling price model. The guidance supersedes the prior multiple element revenue arrangement accounting rules that were previously used by the Company. The Company has adopted this guidance effective April 1, 2010. The adoption did not have a material impact on its financial condition or results of operations.

Stock-Based Compensation

3 Months Ended

Jun. 30, 2010

Statement [Line Items]

Stock-Based Compensation

2. Stock-Based Compensation

The Company accounts for its stock-based compensation at fair value. The following table summarizes employee stock-based compensation expense by financial statement line item for the three months ended June 30, 2010 and 2009 (in thousands):


	Three months ended
	June 30,
	2010		2009
Cost of revenues	$	383	$	225
Research and development		468		467
Selling, general and administrative		2,648		2,374

Total	$	3,499	$	3,066

During the three months ended June 30, 2010, the Company granted approximately 184,000 shares and 284,000 shares of stock options and restricted stock, respectively, to employees under the 2007 Stock Incentive Plan. The fair value of the grants made during the three months ended June 30, 2010 was $11.7 million. The restricted stock awards include approximately 83,000 shares of performance-based restricted stock, which will vest upon achievement of certain financial performance measurements. The remaining shares granted vest upon the passage of time, generally 3 years. For awards that vest upon the passage of time, expense is being recorded over the vesting period. At June 30, 2010, the Company determined that achievement of the performance measures is probable and as such, is recognizing the fair value of the performance-based awards over the estimated performance period of each award.

The total unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of estimated forfeitures, was $24.8 million at June 30, 2010. This expense will be recognized over a weighted-average expense period of 2.3 years.

The assumptions used in the Black-Scholes valuation model for stock options granted during the three months ended June 30, 2010 and 2009 are as follows:


	Three months ended
	June 30,
	2010			2009
Expected volatility		66.4	%		70.6	%
Risk-free interest rate		2.2	%		2.6	%
Expected life (years)		6.1			4.8
Dividend yield	None			None

The expected volatility 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 life 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 for the three months ended June 30, 2010 and the five-year U.S. Treasury rates for the three months ended June 30, 2009. The stock-based compensation expense recognized in the unaudited condensed consolidated statements of income is based on awards that ultimately are expected to vest; therefore, the amount of expense has been reduced for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent period s if actual forfeitures differ from those estimates. Forfeitures were estimated based on historical experience. This analysis is re-evaluated periodically and the forfeiture rate is adjusted as necessary.

Fair Value Measurements

3 Months Ended

Jun. 30, 2010

Statement [Line Items]

Fair Value Measurements

4. Fair Value Measurements

The accounting standard for fair value measurements provides a framework for measuring fair value and requires expanded disclosures regarding fair value measurements. Fair value is defined as the price that would be received for an asset or the exit price that would be paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants on the measurement date. The accounting standard established a fair value hierarchy which requires an entity to maximize the use of observable inputs, where available. This hierarchy prioritizes the inputs into three broad levels as follows:

Valuation Hierarchy


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

The following table provides the assets and liabilities carried at fair value, measured as of June 30, 2010 and March 31, 2010 (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)
June 30, 2010:
Assets:
Cash equivalents	$	3,184	$	3,184	$	—	$	—
Derivatives		239		—		239		—
Short-term marketable securities		44,632		—		44,632		—
Long-term marketable securities		5,961		—		5,961		—

Liabilities:
Derivatives		144		—		144		—


	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, 2010:
Cash equivalents	$	29,054	$	29,054	$	—	$	—
Derivatives		168		—		168		—
Short-term marketable securities		54,469		—		54,469		—
Long-term marketable securities		7,342		—		7,342		—

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 money market accounts and corporate debt instruments.

Marketable Securities

Long-term and short-term marketable securities, consist primarily of government-backed securities and sovereign debt, 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. Short-term marketable securities, with current maturities of greater than three months from original purchase date but less than twelve months from the date of the balance sheet. All marketable securities are considered available-for-sale and are carried at fair value. The Company periodically reviews the realizability of each short 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.

Derivative Financial Instruments

3 Months Ended

Jun. 30, 2010

Statement [Line Items]

Derivative Financial Instruments

5. Derivative Financial Instruments

The Company's foreign currency risk management strategy is principally designed to mitigate the potential financial impact of changes in the value of transactions and balances denominated in foreign currency, resulting from changes in foreign currency exchange rates. The Company's foreign currency hedging program uses both forward contracts and currency options to manage the foreign currency exposures that exist as part of its ongoing business operations.

Cash Flow Hedges

The Company hedges a portion of its intercompany sales of inventory over a maximum period of 15 months using forward foreign exchange contracts accounted for as cash flow hedges to mitigate the impact of volatility associated with foreign currency transactions. To the extent these derivatives are effective in offsetting the variability of the hedged cash flows, and otherwise meet the hedge accounting criteria, changes in the derivatives value are not included in current earnings but are included in Other Comprehensive Income in stockholders' equity. The changes in fair value will subsequently be reclassified into earnings as a component of cost of revenues, as applicable, when the forecasted transaction occurs. To the extent that a previously forecasted transaction is no longer an effective hedge, any ineffectiveness measured in the hedging relationship is recorded currently in earn ings in the period it occurs. The Company does not enter into derivative instruments for trading or speculative purposes.

At June 30, 2010, the Company had three forward contracts outstanding to hedge exposure at the Company's wholly-owned Austrian subsidiary, AMSC Windtec GmbH ("AMSC Windtec"), selling Euros and buying USD at $1.2408, $1.242 and $1.2433, with notional values of $6.9 million, $4.6 million and $2.3 million, respectively. These contracts will expire on September 27, 2010, December 27, 2010 and March 28, 2011, respectively. At June 30, 2010, these forward exchange contracts had an aggregate U.S. dollar equivalent fair value amounting to a net unrealized loss of $0.2 million in other comprehensive income. The net gain or loss from these cash flow hedges reported in accumulated other comprehensive income will be reclassified to earnings and recorded in cost of revenues in our consolidated statement of income when the related inventory is sold to third-party customers.

Other Derivatives

In addition to cash flow hedges, the Company also enters into foreign currency forward exchange contracts to mitigate the impact of foreign exchange risk related to non-functional currency receivable balances in its foreign entities. To the extent that hedge accounting criteria is not met, changes in the fair value of these contracts are recorded in earnings in the period which they occur. These contracts primarily are denominated in the Euro and Chinese renminbi ("CNY") and have maturities of less than six months. On June 30, 2010, the Company had two forward contracts outstanding to hedge USD receivables exposure at AMSC Windtec selling Euros and buying USD at $1.2192 and $1.2173, with notional values of $27.0 million and $24.0 million, respectively, which both expired on July 30, 2010. Gains and losses on these contracts are included in other expense, n et.

The following table provides a summary of the derivative instruments carried at fair value measured as of June 30, 2010 and March 31, 2010 (in thousands):

June 30, 2010

March 31, 2010

Asset

Liability

Balance Sheet

Asset

Liability

Balance Sheet

Derivatives

Location

Derivatives

Location

Foreign currency forward exchange contracts

$239

—

Prepaid expenses and
other current assets

$168

—

Prepaid expenses and
other current assets

Cash flow hedges - foreign exchange contracts

—

144

Accounts payable and
accrued expenses

—

As of June 30, 2010, actual unrealized gains included in Prepaid expenses were $0.2 million for foreign currency forward exchange contracts and actual unrealized losses included in Accrued liabilities were $0.1 million for cash flow hedges. As of March 31, 2010, actual unrealized gains included in Prepaid expenses were $0.2 million for foreign currency forward exchange contracts.

Net realized and unrealized losses on forward contracts and option contracts included in other expense, net, excluding the underlying foreign currency exposure being hedged, were $4.0 million and $0.3 million for the three months ended June 30, 2010 and 2009, respectively.

Accounts Receivable	3 Months Ended
Accounts Receivable	Jun. 30, 2010
Statement [Line Items]
Accounts Receivable	div div style="font-family: 'Times New Roman',Times,serif;" div style="margin-top: 12pt; font-size: 10pt;" align="justify"b6./bnbsp;nbsp;nbsp;nbsp;nbsp;bAccounts Receivable/b /div div style="margin-top: 6pt; font-size: 10pt;" align="justify"nbsp;nbsp;nbsp;nbsp;nbsp;Accounts receivable consisted of the following (in thousands): /div div align="center" table style="font-size: 10pt;" border="0" cellspacing="0" cellpadding="0" width="95%" tr valign="bottom"td width="66%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td td width="10%"nbsp;/td td width="1%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td td width="10%"nbsp;/td td width="1%"nbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td colspan="2" nowrap="nowrap" align="center"bJune 30,/b/td tdnbsp;/td tdnbsp;/td td colspan="2" nowrap="nowrap" align="center"bMarch 31,/b/td tdnbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"b2010/b/td tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"b2010/b/td tdnbsp;/td/tr tr style="background: #cceeff;" valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"Accounts receivable (billed)/div/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"82,150/td tdnbsp;/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"53,825/td tdnbsp;/td/tr tr valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"Accounts receivable (unbilled)/div/td tdnbsp;/td tdnbsp;/td td align="right"10,716/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td align="right"10,305/td tdnbsp;/td/tr tr style="background: #cceeff;" valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"Less: Allowance for doubtful accounts/div/td tdnbsp;/td td nowrap="nowrap" align="left"nbsp;/td td align="right"(2,654/td td nowrap="nowrap")/td tdnbsp;/td td nowrap="nowrap" align="left"nbsp;/td td align="right"(1,927/td td nowrap="nowrap")/td/tr tr style="font-size: 1px;"td div style="text-indent: -15px; margin-left: 15px;"nbsp;/div/td tdnbsp;/td td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td tdnbsp;/td td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td/tr tr valign="bottom"td div style="text-indent: -15px; margin-left: 45px;"Accounts receivable, net/div/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"90,212/td tdnbsp;/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"62,203/td tdnbsp;/td/tr tr style="font-size: 1px;"td div style="text-indent: -15px; margin-left: 15px;"nbsp;/div/td tdnbsp;/td td style="border-top: #000000 3px double;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td tdnbsp;/td td style="border-top: #000000 3px double;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td/tr/table/div div style="margin-top: 6pt; font-size: 10pt;" align="justify"nbsp;nbsp;nbsp;nbsp;nbsp;The Company also recorded net long-term accounts receivables of $16.1nbsp;million and $14.1nbsp;million as of Junenbsp;30, 2010 and Marchnbsp;31, 2010, respectively that are also classified within other assets on the condensed consolidated balance sheet and as long-term deferred revenue. /div/div /div

Product Warranty	3 Months Ended
Product Warranty	Jun. 30, 2010
Statement [Line Items]
Product Warranty	div div style="font-family: 'Times New Roman',Times,serif;" div style="margin-top: 12pt; font-size: 10pt;" align="justify"b8./bnbsp;nbsp;nbsp;nbsp;nbsp;bProduct Warranty/b /div div style="margin-top: 6pt; font-size: 10pt;" align="justify"nbsp;nbsp;nbsp;nbsp;nbsp;The Company generally provides a one to two 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. /div div style="margin-top: 6pt; font-size: 10pt;" align="justify"nbsp;nbsp;nbsp;nbsp;nbsp;Product warranty activity was as follows (in thousands): /div div align="center" table style="font-size: 10pt;" border="0" cellspacing="0" cellpadding="0" width="95%" tr valign="bottom"td width="79%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td td width="2%"nbsp;/td td width="1%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td colspan="6" nowrap="nowrap" align="center"bThree months ended/b/td tdnbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="6" nowrap="nowrap" align="center"bJune 30,/b/td tdnbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"b2010/b/td tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"b2009/b/td tdnbsp;/td/tr tr style="background: #cceeff;" valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"Balance at beginning of period/div/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"6,431/td tdnbsp;/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"4,749/td tdnbsp;/td/tr tr valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"Accruals for warranties during the period/div/td tdnbsp;/td tdnbsp;/td td align="right"2,305/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td align="right"1,115/td tdnbsp;/td/tr tr style="background: #cceeff;" valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"Settlements and adjustments during the period/div/td tdnbsp;/td td nowrap="nowrap" align="left"nbsp;/td td align="right"(2,361/td td nowrap="nowrap")/td tdnbsp;/td td nowrap="nowrap" align="left"nbsp;/td td align="right"(539/td td nowrap="nowrap")/td/tr tr style="font-size: 1px;"td div style="text-indent: -15px; margin-left: 15px;"nbsp;/div/td tdnbsp;/td td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td tdnbsp;/td td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td/tr tr valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"Balance at end of period/div/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"6,375/td tdnbsp;/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"5,325/td tdnbsp;/td/tr/table/div/div /div

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Jun. 30, 2010
Statement [Line Items]
Commitments and Contingencies	10. Commitments and Contingencies From time to time, 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. As of June 30, 2010, the Company had six performance bonds on behalf of its AMSC Windtec and its China subsidiary in support of customer contracts to guarantee supply of core components and software. The total value of the outstanding performance bonds is $2.3 million expiring between September 30, 2010 and March 31, 2014. 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 June 30, 2010 and March 31, 2010, the Company had $5.3 million and $5.7 million, respectively, of restricted cash included in current assets, which includes the restricted cash securing the AMSC Windtec performance bonds noted above. The Company also has an additional $3.5 million in bank guarantees and letters of credit supported by unsecured lines of credit. The Company also has unused, unsecured lines of credit consisting of CNY 11.9 million (approximately $1.8 million) and €2.0 million (approximately $2.4 million) as of June 30, 2010. The line of credit was set to expire on June 30, 2010, but has been extended while we are in discussions with the bank to increase capacity to the line of credit to better facilitate growth in the local working capital requirements of the Company.

Cost-Sharing Arrangements	3 Months Ended
Cost-Sharing Arrangements	Jun. 30, 2010
Statement [Line Items]
Cost-Sharing Arrangements	div div style="font-family: 'Times New Roman',Times,serif;" div style="margin-top: 6pt; font-size: 10pt;" align="justify"b11./bnbsp;nbsp;nbsp;nbsp;nbsp;bCost-Sharing Arrangements/b /div div style="margin-top: 6pt; font-size: 10pt;" align="justify"nbsp;nbsp;nbsp;nbsp;nbsp;The Company has entered into several cost-sharing arrangements with various agencies of the United States government. Funds paid to the Company under these agreements are not reported as revenues but are used to directly offset the Company's research and development ("Ramp;D") and selling, general and administrative ("SGamp;A") expenses, and to purchase capital equipment. /div div style="margin-top: 6pt; font-size: 10pt;" align="justify"nbsp;nbsp;nbsp;nbsp;nbsp;Costs incurred and funding received under these agreements are as follows (in thousands): /div div align="center" table style="font-size: 10pt;" border="0" cellspacing="0" cellpadding="0" width="85%" tr valign="bottom"td width="76%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td colspan="6" nowrap="nowrap" align="center"bThree months ended/b/td tdnbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="6" nowrap="nowrap" align="center"bJune 30,/b/td tdnbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"b2010/b/td tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"b2009/b/td tdnbsp;/td/tr tr style="background: #cceeff;" valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"Costs incurred/div/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"525/td tdnbsp;/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"1,471/td tdnbsp;/td/tr tr valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"Ramp;D expenditures offset by cost sharing funding received/div/td tdnbsp;/td tdnbsp;/td td align="right"141/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td align="right"390/td tdnbsp;/td/tr tr style="background: #cceeff;" valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"Gamp;A expenditures offset by cost sharing funding received/div/td tdnbsp;/td tdnbsp;/td td align="right"122/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td align="right"340/td tdnbsp;/td/tr/table/div div style="margin-top: 6pt; font-size: 10pt;" align="justify"nbsp;nbsp;nbsp;nbsp;nbsp;At Junenbsp;30, 2010, total funding received to date under these agreements was $29.9nbsp;million. /div/div /div

Acquisitions	3 Months Ended
Acquisitions	Jun. 30, 2010
Statement [Line Items]
Acquisitions	12. Acquisitions *Acquisition of Windtec Consulting GmbH* On January 5, 2007, the Company acquired Windtec Consulting GmbH ("AMSC Windtec"), a corporation incorporated according to the laws of Austria. AMSC Windtec develops and sells electrical systems for wind turbines. AMSC Windtec also provides technology transfer for the manufacturing of wind turbines; documentation services; and training and support regarding the assembly, installation, commissioning, and service of wind turbines. The acquisition agreement included an earn-out provision for the issuance of up to an additional 1,400,000 shares of common stock upon AMSC Windtec's achievement of specified revenue objectives during the first four fiscal years following closing of the acquisition. During the fiscal year ended March 31, 2009, the Company recorded contingent consideration of $9.8 million to Goodwill and Additional paid-in capital representing 350,000 shares earned. These 350,000 shares were issued in the first quarter of the fiscal year ending March 31, 2010. During the fiscal year ended March 31, 2010, the Company recorded contingent consideration of $10.8 million to Goodwill and Additional paid-in capital representing 350,000 shares earned. These shares were issued in the first quarter of the fiscal year ended March 31, 2011. During the three months end ed June 30, 2010, the Company recorded contingent consideration of $4.0 million to Goodwill and Additional paid-in capital representing 150,000 shares earned. These 150,000 shares are expected to be issued in the first quarter of the fiscal year ending March 31, 2012. *Investment in Tres Amigas* On October 13, 2009, the Company announced it had made a minority investment in Tres Amigas LLC ("Tres Amigas"), a merchant transmission company, for $1.8 million. Consideration for the investment was $0.8 million in cash and $1.0 million in AMSC common stock. The investment was recorded under the equity method of accounting and is included in Other assets on the condensed consolidated balance sheet. The Company's minority interest in the losses of Tres Amigas are included in Other income (expense), net on the condensed consolidated statements of income, and were immaterial for the three months ended June 30, 2010. The net value of the investment at June 30, 2010 was $1.6 million.

Business Segment Information	3 Months Ended
Business Segment Information	Jun. 30, 2010
Statement [Line Items]
Business Segment Information	div div style="font-family: 'Times New Roman',Times,serif;" div style="margin-top: 12pt; font-size: 10pt;" align="justify"b13./bnbsp;nbsp;nbsp;nbsp;nbsp;bBusiness Segment Information/b /div div style="margin-top: 6pt; font-size: 10pt;" align="justify"nbsp;nbsp;nbsp;nbsp;nbsp;The Company reports its financial results in two reportable business segments: AMSC Power Systems and AMSC Superconductors. /div div style="margin-top: 6pt; font-size: 10pt;" align="justify"nbsp;nbsp;nbsp;nbsp;nbsp;AMSC Power Systems business unit produces a broad range of products to increase electrical grid capacity and reliability; supplies electrical systems used in wind turbines; sells power electronic products that regulate wind farm voltage to enable their interconnection to the power grid; licenses proprietary wind turbine designs to manufacturers of such systems; provides consulting services to the wind industry; and offers products that enhance power quality for industrial operations. /div div style="margin-top: 6pt; font-size: 10pt;" align="justify"nbsp;nbsp;nbsp;nbsp;nbsp;AMSC Superconductors business unit manufactures HTS wire and coils; designs and develops superconductor products, such as power cables, fault current limiters and motors; and manages large-scale superconductor projects. /div div style="margin-top: 6pt; font-size: 10pt;" align="justify" div style="font-family: 'Times New Roman',Times,serif;" div style="margin-top: 6pt; font-size: 10pt;" align="justify"The operating results for the two business segments are as follows (in thousands): /div div align="center" table style="font-size: 10pt;" border="0" cellspacing="0" cellpadding="0" width="100%" tr valign="bottom"td width="80%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td td width="1%"nbsp;/td td width="1%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td colspan="6" nowrap="nowrap" align="center"bThree months ended/b/td tdnbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="6" nowrap="nowrap" align="center"bJune 30,/b/td tdnbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"b2010/b/td tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"b2009/b/td tdnbsp;/td/tr tr style="background: #cceeff;" valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"buRevenues:/u/b/div/td tdnbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td/tr tr valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"AMSC Power Systems/div/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"94,928/td tdnbsp;/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"70,696/td tdnbsp;/td/tr tr style="background: #cceeff;" valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"AMSC Superconductors/div/td tdnbsp;/td tdnbsp;/td td align="right"2,281/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td align="right"2,304/td tdnbsp;/td/tr tr style="font-size: 1px;"td div style="text-indent: -15px; margin-left: 15px;"nbsp;/div/td tdnbsp;/td td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td tdnbsp;/td td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td/tr tr valign="bottom"td div style="text-indent: -15px; margin-left: 45px;"Total/div/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"97,209/td tdnbsp;/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"73,000/td tdnbsp;/td/tr tr style="font-size: 1px;"td div style="text-indent: -15px; margin-left: 15px;"nbsp;/div/td tdnbsp;/td td style="border-top: #000000 3px double;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td tdnbsp;/td td style="border-top: #000000 3px double;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td/tr/table/div div align="center" table style="font-size: 10pt;" border="0" cellspacing="0" cellpadding="0" width="100%" tr valign="bottom"td width="80%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td td width="1%"nbsp;/td td width="1%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td colspan="6" nowrap="nowrap" align="center"bThree months ended/b/td tdnbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="6" nowrap="nowrap" align="center"bJune 30,/b/td tdnbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"b2010/b/td tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"b2009/b/td tdnbsp;/td/tr tr style="background: #cceeff;" valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"buOperating income:/u/b/div/td tdnbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td tdnbsp;/td/tr tr valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"AMSC Power Systems/div/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"25,485/td tdnbsp;/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"15,395/td tdnbsp;/td/tr tr style="background: #cceeff;" valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"AMSC Superconductors/div/td tdnbsp;/td td nowrap="nowrap" align="left"nbsp;/td td align="right"(5,910/td td nowrap="nowrap")/td tdnbsp;/td td nowrap="nowrap" align="left"nbsp;/td td align="right"(5,497/td td nowrap="nowrap")/td/tr tr valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"Unallocated corporate expenses/div/td tdnbsp;/td td nowrap="nowrap" align="left"nbsp;/td td align="right"(3,494/td td nowrap="nowrap")/td tdnbsp;/td td nowrap="nowrap" align="left"nbsp;/td td align="right"(3,507/td td nowrap="nowrap")/td/tr tr style="font-size: 1px;"td div style="text-indent: -15px; margin-left: 15px;"nbsp;/div/td tdnbsp;/td td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td tdnbsp;/td td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td/tr tr style="background: #cceeff;" valign="bottom"td div style="text-indent: -15px; margin-left: 45px;"Total/div/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"16,081/td tdnbsp;/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"6,391/td tdnbsp;/td/tr tr style="font-size: 1px;"td div style="text-indent: -15px; margin-left: 15px;"nbsp;/div/td tdnbsp;/td td style="border-top: #000000 3px double;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td tdnbsp;/td td style="border-top: #000000 3px double;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td/tr/table/div div style="margin-top: 6pt; font-size: 10pt;" align="justify"nbsp;nbsp;nbsp;nbsp;nbsp;The accounting policies of the business segments are the same as those for the consolidated Company, except that 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 income. Unallocated corporate expenses include stock-based compensation expense of $3.5nbsp;million and $3.1nbsp;million for the three months ended Junenbsp;30, 2010 and 2009, respectively. Unallocated corporate expenses for the three months ended Junenbsp;30, 2009 included $0.3nbsp;million of restructuring charges related primarily to the closure of the Company's facility in Westborough, Massachusetts. For the three months ended Junenbsp;30, 2009, unallocated corporate expenses also include operating costs associated with the unoccupied portion of the Company's fo rmer corporate headquarters facility located in Westborough, Massachusetts. /div div style="margin-top: 6pt; font-size: 10pt;" align="justify"nbsp;nbsp;nbsp;nbsp;nbsp;For the quarter ended Junenbsp;30, 2010, 72% of the Company's revenues were derived from one customer: Sinovel Wind Co., Ltd. ("Sinovel"), a manufacturer of wind turbines based in China. For the quarter ended Junenbsp;30, 2009, a substantial portion of the Company's revenues was derived from three customers: Sinovel; ACCIONA S.A., a Spanish renewable power company; and a U.S. subsidiary of National Grid, an energy company. Sales to Sinovel, ACCIONA and National Grid were 53%, 14% and 10%, respectively, for the three months ended Junenbsp;30, 2009. /div div style="margin-top: 6pt; font-size: 10pt;" align="justify"nbsp;nbsp;nbsp;nbsp;nbsp;Total assets for the two business segments are as follows (in thousands): /div div align="center" table style="font-size: 10pt;" border="0" cellspacing="0" cellpadding="0" width="100%" tr valign="bottom"td width="80%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td td width="1%"nbsp;/td td width="1%"nbsp;/td td width="5%"nbsp;/td td width="1%"nbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td colspan="2" nowrap="nowrap" align="center"bJune 30,/b/td tdnbsp;/td tdnbsp;/td td colspan="2" nowrap="nowrap" align="center"bMarch 31,/b/td tdnbsp;/td/tr tr style="font-size: 8pt;" valign="bottom"tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"b2010/b/td tdnbsp;/td tdnbsp;/td td style="border-bottom: #000000 1px solid;" colspan="2" nowrap="nowrap" align="center"b2010/b/td tdnbsp;/td/tr tr style="background: #cceeff;" valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"AMSC Power Systems/div/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"217,632/td tdnbsp;/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"179,873/td tdnbsp;/td/tr tr valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"AMSC Superconductors/div/td tdnbsp;/td tdnbsp;/td td align="right"39,751/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td align="right"32,978/td tdnbsp;/td/tr tr style="background: #cceeff;" valign="bottom"td div style="text-indent: -15px; margin-left: 15px;"Corporate assets/div/td tdnbsp;/td tdnbsp;/td td align="right"152,650/td tdnbsp;/td tdnbsp;/td tdnbsp;/td td align="right"187,333/td tdnbsp;/td/tr tr style="font-size: 1px;"td div style="text-indent: -15px; margin-left: 15px;"nbsp;/div/td tdnbsp;/td td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td tdnbsp;/td td style="border-top: #000000 1px solid;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td/tr tr valign="bottom"td div style="text-indent: -15px; margin-left: 45px;"Total/div/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"410,033/td tdnbsp;/td tdnbsp;/td td align="left"nbsp;nbsp;$/td td align="right"400,184/td tdnbsp;/td/tr tr style="font-size: 1px;"td div style="text-indent: -15px; margin-left: 15px;"nbsp;/div/td tdnbsp;/td td style="border-top: #000000 3px double;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td tdnbsp;/td td style="border-top: #000000 3px double;" colspan="2" nowrap="nowrap" align="right"nbsp;/td tdnbsp;/td/tr/table/div table width="90%" trtd style="color: #ffffff; font-size: 1pt;"nbsp;/td/tr/table/div/div/div /div

Income Taxes	3 Months Ended
Income Taxes	Jun. 30, 2010
Statement [Line Items]
Income Taxes	9. Income Taxes The Company recorded income tax expense of $7.3 million and $2.9 million for the three months ended June 30, 2010 and 2009, respectively, related primarily to income generated in foreign jurisdictions. The Company has provided a valuation allowance against all deferred tax assets in the U.S. as it is more likely than not that its deferred tax assets are not currently realizable due to the net operating losses incurred by the Company in the U.S. since its inception.

Subsequent Events	3 Months Ended
Subsequent Events	Jun. 30, 2010
Statement [Line Items]
Subsequent Events	div div style="font-family: 'Times New Roman',Times,serif;" div style="margin-top: 12pt; font-size: 10pt;" align="justify"b14./bnbsp;nbsp;nbsp;nbsp;nbsp;bSubsequent Events/b /div div style="margin-top: 6pt; font-size: 10pt;" align="justify"nbsp;nbsp;nbsp;nbsp;nbsp;The Company has performed an evaluation of subsequent events through Augustnbsp;5, 2010, which is the date the financial statements were issued. /div/div /div