Document And Entity Information Document And Entity Information [Abstract] Statement [Tables] Statement [Table] Statement [Line Items] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Common Stock Entity Common Stock, Shares Outstanding Condensed Consolidated Balance Sheets [Abstract] ASSETS - balance sheet ASSETS Cash and cash equivalents- Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Marketable securities-current Marketable securities Marketable Securities, Current, Total Short-term marketable securities Accounts receivable, net Accounts receivable, net Inventory - net Inventory Net inventory The total of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer, and the aggregate carrying amount of current assets, as of the balance sheet date, not separately presented elsewhere in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer). Prepaid Expense And Other Assets Current Prepaid expenses and other current assets Restricted cash. Restricted cash Restricted cash included in long term assets Deferred Tax Assets Gross Deferred Tax Assets, Net, Current, Ending Balance Deferred Tax Assets, Net, Current, Beginning Balance Deferred tax assets Deferred tax assets, net Total current assets Total current assets Property, plant and equipment, net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Total Intangibles, net Intangible Assets, Net (Excluding Goodwill), Total Restricted cash Restricted cash included in long-term assets Restricted cash included in long term assets Deferred tax assets Deferred Tax Assets, Gross, Total Other assets Other assets Assets Total assets Total assets LIABILITIES AND STOCKHOLDERS EQUITY LIABILITIES AND STOCKHOLDERS' EQUITY Accounts Payable And Accrued Liabilities Current Accounts Payable and Accrued Liabilities, Current, Total Accounts payable and accrued expenses Adverse purchase commitments. Adverse Purchase Commitments Adverse purchase commitments Deferred rev. Deferred revenue Deferred revenue Deferred Tax Liabilities, Current Deferred tax liabilities Total current liabilities Total current liabilities Deferred revenue, noncurrent Deferred revenue Deferred Revenue, Noncurrent, Total Deferred tax liabilities Other Other Liabilities Total liabilities Commitments and contingencies. Commitments and contingencies1 Commitments and contingencies (Note 10) Stockholders' equity: Common stock Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common stock Common Stock, Value, Issued, Total Additional paid-in capital Additional Paid in Capital, Ending Balance Additional Paid in Capital, Beginning Balance Additional Paid in Capital, Total Treasury Stock, Value Treasury stock Treasury Stock, Value, Ending Balance Treasury Stock, Value, Beginning Balance Restricted stock which are vested returned by employee, value Treasury Stock Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated other comprehensive (loss) income Retained Earnings Accumulated Deficit Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Accumulated deficit Accumulated deficit Total stockholders' equity Balance Balance Total stockholders' equity Liabilities and Stockholders' Equity Total liabilities and stockholders' equity Condensed Consolidated Statements Of Operations [Abstract] Revenue Revenues Revenues Cost and operating expenses: Cost of revenues Cost of Revenue, Total Research and development Research and Development Expense, Total Selling, general and administrative Selling, General and Administrative Expense, Total Other Asset Impairment Charges Write-off of advance payment Write-off of advance payment Amortization of acquisition related intangibles Amortization of Intangible Assets, Total Restructuring and impairments Restructuring and impairments Restructuring and impairments Total cost and operating expenses Total cost and operating expenses Total cost and operating expenses Operating income Operating (loss) income Operating (loss) income Operating (loss) income Interest Income (Expense), Net Interest income (expense), net Interest Income (Expense), Net, Total Interest income, net Other income, net Other income (expense), net Income (loss) before income tax expense Income (loss) before income tax expense Income tax expense Income tax expense Income tax expense Net income Net income (loss) Net (loss) income Net (loss) income Net (loss) income per common share Basic Net income per share - basic Basic Net (loss) income per share basic EPS - Diluted Diluted Diluted Net (loss) income per share diluted Weighted average number of common shares outstanding Basic - shares outstanding Basic Shares used in per-share calculation basic Shares used in per-share calculation - basic Diluted Shares used in per-share calculation diluted Shares used in per-share calculation - diluted Condensed Consolidated Statements Of Comprehensive (Loss) Income [Abstract] Other comprehensive (loss) income, net of tax: Other comprehensive income (loss), net of tax: Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax Net foreign exchange rate impact Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Foreign currency translation (losses) gains Unrealized (losses) gains on cash flow hedges Unrealized (losses) gains on cash flow hedges Other Comprehensive Income, Derivatives Qualifying as Hedges, Net of Tax, Total Unrealized gains on cash flow hedges Other Comprehensive Income, Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Unrealized losses on investments Unrealized losses on investments Other Comprehensive Income (Loss), Net of Tax Total other comprehensive (loss) income, net of tax Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive (loss) income Condensed Consolidated Statements Of Cash Flows [Abstract] Cash flows from operating activities: Adjustments to reconcile net (loss) income to net cash used in operations: Depreciation and amortization Depreciation, Depletion and Amortization, Total Employee Benefits And Share Based Compensation Stock-based compensation expense Employee Benefits and Share-based Compensation, Total Stock-based compensation expense Inventory Write-down Provision for excess and obsolete inventory Inventory write-downs Losses on purchase commitments. Losses on purchase commitments Adverse purchase commitment (recoveries) losses Adverse purchase commitment losses, net Allowance for doubtful accounts Allowance for doubtful accounts Allowance for doubtful accounts The increase (decrease) during the reporting period in the amount of payments made in advance for income and other taxes, which will be charged against earnings in future periods. Increase Decrease In Prepaid Taxes Write-off of prepaid value added taxes Restructuring Charges Restructuring charges Restructuring Charges, Total Charges to operations Impairment of Long-Lived Assets Held-for-use Impairment of long-lived assets Deferred income taxes Deferred Income Tax Expense (Benefit), Total Other non-cash items Changes in operating asset and liability accounts: Increase Decrease In Accounts Receivable Accounts receivable Accounts receivable Increase Decrease In Inventories Inventory Inventory Increase (Decrease) in Inventories, Total Increase (Decrease) in Prepaid expenses and other current assets Prepaid expenses and other current assets Prepaid expenses and other current assets Increase (Decrease) in Prepaid, Deferred Expense and Other Assets, Total Accounts payable and accrued expenses-changes Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total Deferred revenue Deferred revenue Net cash used in operating activities Net cash used in operating activities Cash flows from investing activities: Purchase of property, plant and equipment Purchase of property, plant and equipment Payments to Acquire Property, Plant, and Equipment, Total Purchase of marketable securities Purchase of marketable securities Payments to Acquire Marketable Securities, Total Proceeds from the maturity of marketable securities Proceeds from Sale and Maturity of Marketable Securities, Total Proceeds from maturities of marketable securities Change in restricted cash Change in restricted cash Increase (Decrease) in Restricted Cash, Total Purchase of intangible assets Purchase of intangible assets Payments to Acquire Additional Interest in Subsidiaries Purchase of minority investments Purchase of minority investment Payments to Acquire Businesses, Gross Advance payment for previously planned acquisition Advanced payment for planned acquisition Change in other assets Change in other assets Change in other assets Change in other assets Net cash used in investing activities Net cash provided by (used in) investing activities Cash flows from financing activities: Payments for Repurchase of Common Stock Payments in lieu of issuance of common stock for payroll taxes Payments in lieu of issuance of common stock for payroll taxes Proceeds from exercise of employee stock options and ESPP Proceeds from exercise of employee stock options Net Cash Provided by (Used in) Financing Activities Net cash (used in) provided by financing activities Effect of exchange rate changes on cash and cash equivalents Effect of exchange rate changes on cash and cash equivalents Net decrease in cash and cash equivalents Net decrease in cash and cash equivalents Supplemental Cash Flow Information [Abstract] Supplemental schedule of cash flow information: Income Taxes Paid Cash paid for income taxes Non-cash contingent consideration in connection with acquisitions Non-Cash Contingent Consideration In Connection With Acquisitions Non-cash contingent consideration in connection with acquisitions Non-cash issuance of common stock Non Cash Issuance Of Common Stock Non-cash issuance of common stock Description Of The Business And Basis Of Presentation [Abstract] Description Of The Business And Basis Of Presentation [Abstract] Description of the Business and Presentations Description Of The Business And Basis Of Presentation Stock-Based Compensation [Abstract] Disclosure Of Compensation Related Costs Share Based Payments Text Block Stock-Based Compensation Computation Of Net (Loss) Income Per Common Share [Abstract] Computation Of Net (Loss) Income Per Common Share [Abstract] Earnings Per Share Text Block Computation Of Net (Loss) Income Per Common Share Fair Value Measurements [Abstract] Fair Value Disclosures Fair Value Measurements Accounts Receivable [Abstract] Accounts Receivable Text Block Accounts Receivable Inventory [Abstract] Inventory Disclosure Text Block Inventory Product Warranty [Abstract] Product Warranty Disclosure Text Block Product Warranty Income Taxes Income Taxes [Abstract] Income Tax Disclosure Text Block Income Taxes Restructuring And Impairments [Abstract] The entire disclosure for aggregate costs incurred during the period for restructuring, remediation, implementation, integration and asset impairment activities. Description of restructuring activities such as exit and disposal activities, could include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled. This would also include disclosure of the charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. Restructuring Impairment And Other Activities Disclosure [Text Block] Restructuring And Impairments Commitments and Contingencies Commitments And Contingencies [Abstract] Commitments And Contingencies Disclosure Text Block Commitments And Contingencies Equity Investments [Abstract] Equity Investments [Abstract] Equity Method Investments Disclosure [Text Block] Equity Investments Equity Method Investments Business Segments [Abstract] Business Segments [Abstract] Segment Reporting Disclosure Text Block Business Segments Business Segment and Geographic Information Recent Accounting Pronouncements [Abstract] Recent Accounting Pronouncements [Text Block] Recent Accounting Pronouncements [Text Block] Recent Accounting Pronouncements Subsequent Events [Abstract] Subsequent Events [Abstract] The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. Subsequent Events [Text Block] Subsequent Events Disclosure of accounting policy for determining the fair value of financial instruments. Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value Measurements And Disclosures Disclosure of accounting policy for completed business combinations (purchase method, acquisition method or combination of entities under common control). This accounting policy may include a general discussion of the purchase method or acquisition method of accounting (including for example, the treatment accorded contingent consideration, the identification of assets and liabilities, the purchase price allocation process, how the fair values of acquired assets and liabilities are determined) and the entity's specific application thereof. An entity that acquires another entity in a leveraged buyout transaction generally discloses the accounting policy followed by the acquiring entity in determining the basis used to value its interest in the acquired entity, and the rationale for that accounting policy. Business Combinations Policy [Policy Text Block] Business Combinations Comprehensive Income Policy [Policy Text Block]. Comprehensive Income Policy [Policy Text Block] Comprehensive Income Schedule Of Stock Based Compensation Expenses Included In Consolidated Statement Of Income [Text Block] Schedule Of Stock Based Compensation Expenses Included In Consolidated Statement Of Income [Text Block] Employee Stock-Based Compensation Expenses Included In Consolidated Statements Of Income Summary Of Stock-Based Compensation Expense By Financial Statement Line Item Schedule Of Weighted Average Assumptions Used In The Black-Scholes Valuation Model For Stock Options Granted [Text Block] Schedule Of Weighted Average Assumptions Used In The Black Scholes Valuation Model For Stock Options Granted [Text Block] Weighted-Average Assumptions Used In The Black-Scholes Valuation Model For Stock Options Granted Schedule Of Earnings Per Share Basic And Diluted [Text Block] Schedule Of Earnings Per Share Basic And Diluted [Text Block] Schedule Of Earnings Per Share Calculation Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings [Text Block] Schedule Of Assets Carried At Fair Value Schedule Of Accounts Receivable [Text Block] Schedule Of Accounts Receivable [Text Block] Schedule Of Accounts Receivable Schedule Of Inventory Current Table [Text Block] Schedule Of Inventory Current Table [Text Block] Components Of Inventory Schedule Of Product Warranty Liability Table [Text Block] Schedule Of Product Warranty Liability Table [Text Block] Schedule Of Product Warranty Schedule of Restructuring and Related Costs [Text Block] Schedule Of Restructuring Charges And Cash Payments Schedule of Equity Method Investments [Table] Schedule of Equity Method Investment, Equity Method Investee, Name [Axis] Equity Method Investee, Name [Domain] Tres Amigas [Member] Tres Amigas Member Tres Amigas [Member] Blade Dynamics Ltd. [Member] Blade Dynamics Ltd Member Blade Dynamics Ltd. [Member] Schedule of Equity Method Investments [Line Items] Equity Method Investments [TextBlock] Schedule Of Net Investment Activity Equity Method Investments Text Block Schedule Of Business Segment Operating Results [Text Block] Schedule Of Business Segment Operating Results [Text Block] Schedule Of Business Segments Operating Results Schedule Of Business Segment Assets [Text Block] Schedule Of Business Segment Assets [Text Block] Schedule Of Business Segments Assets Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. Schedule Of Revenue By Major Customers By Reporting Segments [Table Text Block] Customers Who Represented 10% Or More Of The Company's Total Revenues Schedule of Entity-Wide Information, Revenue from External Customers by Products and Services [Table] Entity-Wide Information, Revenue from External Customer [Line Items] Forfeiture of cash advance. Forfeiture Of Cash Advance Potential forfeiture of cash advance Write-off of an advance payment Cash, cash equivalent, marketable securities and restricted cash. Cash Cash Equivalent Marketable Securities And Restricted Cash Cash, cash equivalents, marketable securities and restricted cash The number of positions eliminated during the period as a result of restructuring activities. Restructuring And Related Cost Number Of Positions Eliminated Headcount reduction due to 2011 Plan, positions The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s). Restructuring And Related Cost Number Of Positions Eliminated Period Percent Headcount reduction due to 2011 Plan, percentage of workforce Approximate savings resulted from reduction of positions. Approximate Savings Resulted From Reduction Of Positions Approximate savings resulted from reduction of positions Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Information by type of estimate, including, but not limited to, upper and lower bound amounts, maximum and minimum amounts, and point estimates. Range Axis Type of estimate, including, but not limited to, upper and lower bound amounts, maximum and minimum amounts, and point estimates. Range [Domain] Greater than (or equal to) the amount. Minimum Member Minimum [Member] Less than (or equal to) the amount. Maximum Member Maximum [Member] Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits, by Title of Individual [Axis] Title of Individual with Relationship to Entity [Domain] Management [Member] Former Executive Officer [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Stock Options [Member] Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period Stock options granted in period Share-Based Compensation, stock grants in period Share Based Compensation Arrangement By Share Based Payment Award Performance Based Restricted Stock Grants In Period Share Based Compensation Arrangement By Share Based Payment Award Performance Based Restricted Stock Grants In Period Performance-based restricted stock granted in period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Shares granted vesting period, years Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures Employee Service Share-based Compensation, Unrecognized Compensation Costs on Nonvested Awards, Weighted Average Period of Recognition Period over which unrecognized compensation expense is expected to be recognized (years) Allocated Share-based Compensation Expense Employee stock-based compensation expense Allocated Share-based Compensation Expense, Total Stock-based compensation expense Share based compensation arrangement by share based payment award expiration date. Share Based Compensation Arrangement By Share Based Payment Award Expiration Date Average time period taken in calculating risk-free interest rate, years Component of Other Operating Cost and Expense [Table] Component of Other Operating Cost and Expense, General [Axis] Component of Other Operating Cost and Expense, Name [Domain] Research And Development [Member] Selling General And Administrative Expense [Member] Selling General And Administrative Expense Member Selling, General And Administrative Expense [Member] Component of Operating Other Cost and Expense [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected life (years) Share-based compensation arrangement by share based payment award, fair value assumptions stated expected dividend rate. Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Stated Expected Dividend Rate Dividend yield Weighted Average Shares Of Common Stock Outstanding Weighted Average Shares Of Common Stock Outstanding Weighted-average shares of common stock outstanding Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation Weighted-average shares subject to repurchase Dilutive Effect Of Employee Equity Incentive Plans Shares Dilutive Effect Of Employee Equity Incentive Plans Shares Dilutive effect of employee equity incentive plans Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Common equivalent shares excluded from calculation of diluted EPS as they were considered anti-dilutive Schedule of Fair Value of Separate Accounts by Major Category of Investment [Table] Defined Benefit Plan, Fair Value of Plan Assets by Measurement [Axis] Fair Value Plan Asset Measurement [Domain] Quoted Prices In Active Markets (Level 1) [Member] Using Significant Other Observable Inputs (Level 2) [Member] Fair Value, Option, Quantitative Disclosures [Line Items] Cash Equivalents, at Carrying Value Cash equivalents Cash Equivalents, at Carrying Value, Total US Government Securities, at Carrying Value Short-term government-backed securities Commercial Paper, at Carrying Value Short-term commercial paper Derivative Assets Derivatives - assets Derivative Assets, Total Derivatives The amount of the transfers of assets or liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. Fair Value, Level 1 to level 2 Transfers, Amount Transfers of assets and liabilities between Level 1 and Level 2 Billed Contracts Receivable Accounts receivable (billed) Unbilled Contracts Receivable Accounts receivable (unbilled) Allowance for Doubtful Accounts Receivable, Current Less: Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current, Ending Balance Allowance for Doubtful Accounts Receivable, Current, Beginning Balance Less: Allowance for doubtful accounts Notes, Loans and Financing Receivable, Net Notes, Loans and Financing Receivable, Net, Total Notes receivable outstanding Inventory, Raw Materials Raw materials Inventory, Raw Materials, Total Inventory, Work in Process Work-in-process Inventory, Finished Goods Finished goods Inventory, Finished Goods, Total Inventory for Long-term Contracts or Programs Deferred program costs Product Warranty [Line Items] Product Warranty [Line Items] Product Warranty Accrual Balance at end of period Balance at beginning of period Product Warranty Accrual, Total Product Warranty Accrual, Warranties Issued Change in accruals for warranties during the period Product Warranty Accrual, Warranties Issued, Total Product Warranty Accrual, Preexisting, Increase (Decrease) Settlements during the period Product Warranty Accrual, Preexisting, Increase (Decrease), Total Warranty period Warranty period Warranty period, in years Current Income Tax Expense (Benefit) Current Income Tax Expense (Benefit), Total Additional income tax expense Schedule of Restructuring and Related Costs [Table] Restructuring and Related Cost, by Type of Restructuring [Axis] Type of Restructuring [Domain] Severance Pay And Benefits [Member] Facility Exit Costs [Member] Restructuring and Related Cost [Line Items] Restructuring Reserve Accrued restructuring balance at September 30, 2011 Accrued restructuring balance at April 1, 2011 Restructuring Reserve, Total Restructuring Reserve, Period Expense Charges to operations Restructuring Reserve, Settled with Cash Cash payments Restructuring Reserve, Settled with Cash, Total Cash payments Severance Costs Employee severance and benefit costs Area of space vacated. Area Of Space Vacated Area of space vacated, square feet Lease rentals discount rate. Lease Rentals Discount Rate Lease rentals discount rate Business Exit Costs Facility exit costs Impairment of Long-Lived Assets to be Disposed of Impairment charges of long-lived assets for which there is no remaining future economic benefit Commitments And Contingencies [Table] Commitments And Contingencies [Table] Fair Value, Off-balance Sheet Risks by Financial Instrument [Axis] Fair Value, Off-balance Sheet Risks, Financial Instruments [Domain] Chinese Yen Line Of Credit [Member] Chinese Yen Line Of Credit Member Chinese Yen Line Of Credit [Member] Euro Line Of Credit [Member] Euro Line Of Credit Member Euro Line Of Credit [Member] Sinovel Wind Group Co Ltd [Member] Sinovel Wind Group Co Ltd Member Sinovel Wind Group Co. Ltd. [Member] Dalian Guotong Electric Co Ltd [Member] Dalian Guotong Electric Co Ltd Member Dalian Guotong Electric Co. Ltd. [Member] AMSC Windtec [Member] Amsc Windtec Member AMSC Windtec [Member] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Adverse purchase commitments included in purchase commitment. Adverse Purchase Commitments Included In Purchase Commitment Adverse purchase commitments included in purchase commitment Adverse purchase commitment recoveries. Adverse Purchase Commitment Recoveries Adverse purchase commitment recoveries Loss Contingency, New Claims Filed, Number Number of putative securities complaints The value (monetary amount) of the award the plaintiff seeks in the legal matter. Loss Contingency, Damages Sought, Value Claim amount per request for arbitration Gain contingency damages sought value. Gain Contingency Damages Sought Value Monetary damages due to breaches of contracts The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity must commit resources to supply goods or services to one or more customers. Supply Commitment Remaining Minimum Amount Committed Value of the undelivered components Loss contingency net amount of damages. Loss Contingency Net Amount Of Damages Net amount of damages claimed Damages claimed for unauthorized use of software. Damages Claimed For Unauthorized Use Of Software Damages claimed for unauthorized use of software Monetary damages for trade secret infringement. Monetary Damages For Trade Secret Infringement Monetary damages for trade secret infringement Counterclaim for damages sought. Counterclaim For Damages Sought Counterclaim under License Agreement Counterclaim for damages sought Number Of Performance Bonds For Long Term Contracts Number Of Performance Bonds For Long Term Contracts Number of outstanding performance bonds Contract Guarantees Outstanding Performance Bonds Value Total Contract Guarantees Outstanding Performance Bonds Value Total Total value of outstanding performance bonds Performance Bond Expiration Date Performance Bond Expiration Date Performance bond latest expiration date Restricted Cash and Investments, Current Restricted cash included in current assets Restricted Cash and Investments, Current, Total Line of Credit Facility, Increase, Additional Borrowings Additional unsecured letters of credit Unsecured, Unused Lines Of Credit Fair Value Unsecured, Unused Lines Of Credit Fair Value Unused, unsecured lines of credit Line of Credit Facility, Amount Outstanding Net borrowings on lines of credit outstanding Borrowings on lines of credit Line of Credit Facility, Decrease, Repayments Line of credit facility repaid Business Acquisition, Effective Date of Acquisition Acquisition date Equity Method Investment, Aggregate Cost Equity method investment, aggregate cost Equity method investment in cash. Equity Method Investment In Cash Equity method investment in cash Equity Method Investment Equity method investment in common stock Cash consideration for increase in minority position Cash consideration for increase in minority position Equity Method Investment, Ownership Percentage Equity method investment ownership percentage Net Investment Activity In Business Acquisitions Net Investment Activity In Business Acquisitions Balance at September 30, 2011 Balance at April 1, 2011 Cash paid for acquisition Cash investment in business acquisition Purchase of minority investment Net Income (Loss) Attributable to Noncontrolling Interest Minority interest in net losses Net Income (Loss) Attributable to Noncontrolling Interest, Total Schedule of Segment Reporting Information, by Segment [Table] Statement, Business Segments [Axis] Segment, Business [Domain] Unallocated Corporate Expenses [Member] Unallocated Corporate Expenses Member Unallocated Corporate Expenses [Member] Segment Reporting Information [Line Items] Restructuring Costs and Asset Impairment Charges Restructuring Costs and Asset Impairment Charges, Total Restructuring costs and asset impairment charges Schedule of Entity-Wide Revenue by Major Customers, by Reporting Segments [Table] Grid [Member] Grid Member Grid [Member] Wind [Member] Wind Member Wind [Member] Corporate Assets [Member] Corporate Assets Member Corporate Assets [Member] Segment Reporting, Asset Reconciling Item [Line Items] Major Customers [Axis] Name of Major Customer [Domain] Inox Wind Ltd [Member] Inox Wind Ltd Member Inox Wind Ltd [Member] Doosan Heavy Industries & Construction Co Ltd. [Member] Doosan Heavy Industries Construction Co Ltd Member Doosan Heavy Industries & Construction Co Ltd. [Member] Dongfang Electric Machinery Co [Member] Dongfang Electric Machinery Co Member Dongfang Electric Machinery Co [Member] Sinovel Wind Co., Ltd. [Member] Sinovel Wind Co Ltd Member Sinovel Wind Co., Ltd [Member] Entity-Wide Revenue, Major Customer [Line Items] The percentage of net product revenue to total net revenue from the sale of goods as of year end. Sales Revenue, Goods, Net, Percentage Revenue, percentage Loss On Long-Term Purchase Commitment [Member] U.S. Treasury Rates [Member] Cost Of Revenues [Member]