Document And Entity Information
Intangible assets
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles
Note To Financial Statement Details Textual
Note 2 - Acquisition
Note 3 - Revenue Recognition
Note 4 - Stock-based Compensation
Note 5 - Computation of Net Loss Per Common Share
Note 6 - Goodwill and Other Intangibles
Note 7 - Fair Value Measurements
Note 8 - Accounts Receivable
Note 9 - Inventory
Prepaid expenses and other current assets
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
Note 11 - Property, Plant and Equipment
Accounts receivable
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
Income Tax Disclosure [Text Block]
Note 12 - Equity Method Investments
Note 13 - Accounts Payable and Accrued Expenses
Note 15 - Contingent Consideration
Cash and cash equivalents
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
Note 17 - Leases
Inventory
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
Contingent consideration
Note 19 - Business Segments
us-gaap_LiabilitiesCurrent
Total current liabilities
Note 2 - Acquisition - Schedule of Business Acquisitions (Details)
Note 2 - Acquisition - Assets Acquired and Liabilities Assumed (Details)
Note 2 - Acquisitions - Pro Forma Information (Details)
Note 3 - Revenue Recognition - Disaggregation of Revenue (Details)
Issuance of 1,297,600 shares of Company’s Common Stock
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable
Note 3 - Revenue Recognition - Contract Assets and Liabilities (Details)
Note 3 - Revenue Recognition - Revenues by Major Customers (Details)
us-gaap_BusinessCombinationConsiderationTransferred1
Business Combination, Consideration Transferred
Note 4 - Stock-based Compensation - Stock-based Compensation Expense by Financial Statement Line Item (Details)
Note 5 - Computation of Net Loss Per Common Share - Reconciliation of Numerators and Denominators of EPS Calculation (Details)
Note 6 - Goodwill and Other Intangibles - Schedule of Goodwill (Details)
us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year)
Note 6 - Goodwill and Other Intangibles - Intangible Assets (Details)
Note 6 - Goodwill and Other Intangibles - Expected Future Amortization Expense (Details)
Note 7 - Fair Value Measurements - Assets and Liabilities Carried at Fair Value on a Recurring Basis (Details)
Note 7 - Fair Value Measurements - Derivative Liability Measured at Fair value (Details)
Note 8 - Accounts Receivable - Summary of Accounts Receivable (Details)
us-gaap_LiabilityForUncertainTaxPositionsCurrent
Liability for Uncertainty in Income Taxes, Current
Note 9 - Inventory - Summary of Net Inventory (Details)
Note 11 - Property, Plant and Equipment - Cost and Accumulated Depreciation of Property and Equipment (Details)
us-gaap_BusinessAcquisitionSharePrice
Business Acquisition, Share Price (in dollars per share)
Note 12 - Equity-Method Investments - Schedule of Equity Method Investment Summarized Financial Information (Details)
Note 13 - Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Details)
Note 13 - Accounts Payable and Accrued Expenses - Product Warranty Activity (Details)
Note 15 - Contingent Consideration - Summary of the Key Assumptions Used to Calculate Fair Value of Warrants (Details)
us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Basic (in dollars per share)
Note 17 - Leases - Operating Lease Assets and Liabilities (Details)
us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Foreign currency translation (loss) gain
Note 17 - Leases - Lease Cost (Details)
Cumulative translation adjustment
Cumulative translation adjustment
Note 17 - Leases - Minimum Future Lease Obligation (Details)
Note 19 - Business Segments - Operating Results for Business Segments (Details)
Note 19 - Business Segments - Total Business Segments Assets (Details)
Debt, current portion
Debt, Current
Notes To Financial Statements
Notes To Financial Statements [Abstract]
us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
Diluted (in dollars per share)
Customer Relationship, Core Technology and Know-how [Member]
Represents information pertaining to customer relationship, core technology and know-how intangible assets.
us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Net income (loss)
Business Acquisition, Pro Forma Information [Table Text Block]
us-gaap_BusinessAcquisitionsProFormaRevenue
Net Revenue
Business Combination, Contingent Consideration, Liability, Measurement Input
Accounts payable and accrued expenses
Total
Deferred revenue, current portion
Goodwill and Intangible Assets Disclosure [Text Block]
Schedule of Goodwill [Table Text Block]
Accrued compensation
Income taxes payable
Lessee, Operating Leases [Text Block]
Accounts payable
Postemployment Retirement Benefits [Member]
Retirement Plan Type [Axis]
Retirement Plan Type [Domain]
amsc_ProceedsFromEmployeeRetentionCredit
Proceeds From Employee Retention Credit
Represents proceeds received for initial claims that were processed.
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Accrued other miscellaneous expenses
us-gaap_PolicyTextBlockAbstract
Accounting Policies
Accrued product warranty
Trade Names [Member]
Accrued commissions
us-gaap_StockIssued1
Issuance of common stock
Indefinite-Lived Intangible Assets [Axis]
Indefinite-Lived Intangible Assets, Major Class Name [Domain]
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of property, plant and equipment
Non-cash investing and financing activities
us-gaap_WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation
Weighted-average shares subject to repurchase (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)
Cash paid for income taxes, net of refunds
Weighted-average shares of common stock outstanding (in shares)
us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Current liabilities:
Operating leases
Total assets
Total assets
Supplemental schedule of cash flow information:
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)
Customer Relationships [Member]
Deferred tax assets
Finite-Lived Intangible Assets by Major Class [Axis]
Share-Based Payment Arrangement [Text Block]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
Contingent Consideration by Type [Axis]
Contingent Consideration Type [Domain]
Award Type [Domain]
Restricted cash
Net loss
Net income (loss)
Net Income (Loss) Attributable to Parent
Net income (loss)
Award Type [Axis]
us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Accumulated Amortization
us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsRevenuesAndGainsRecognized
Business Combination, Separately Recognized Transactions, Revenues and Gains Recognized
Net Book Value
us-gaap_FiniteLivedIntangibleAssetsNet
Total
Intangible assets, net
Intangibles, net
Gross Amount
us-gaap_FiniteLivedIntangibleAssetsGross
Restricted Stock [Member]
Share-Based Payment Arrangement [Member]
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities [Axis]
Antidilutive Securities, Name [Domain]
us-gaap_GoodwillAcquiredDuringPeriod
Megatran Acquisition
Thereafter
Amount of lessee's undiscounted obligation for lease payment for operating lease due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).
Trade name and trademarks
us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Business Combination Disclosure [Text Block]
Commitments and Contingencies Disclosure [Text Block]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]
Property, plant and equipment, net
us-gaap_PropertyPlantAndEquipmentNet
Goodwill
Goodwill
Balance
Balance
Issuance of common stock to settle contingent consideration
Value of stock issued to settle contingent consideration.
Issuance of common stock to settle contingent consideration (in shares)
Number of shares of stock issued during the period to settle contingent consideration.
us-gaap_EquityMethodInvestmentOwnershipPercentage
Equity Method Investment, Ownership Percentage
Deferred tax liabilities, current portion
Amount of current deferred tax liability attributable to taxable differences with jurisdictional netting.
Northeast Power Systems, Inc (NEPSI) [Member]
Represents Northeast Power Systems, Inc (NEPSI).
amsc_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHighNumberOfShares
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High, Number of Shares (in shares)
For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid in shares.
Megatran Acquisition [Member]
Represents information pertaining to the Megatran Acquisition.
Cash flows from investing activities:
Net income (loss) per common share
Earnings Per Share [Text Block]
us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income from operation
us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Accounts payable and accrued expenses
Equity-method investments
Income tax (benefit) expense
Income Tax Expense (Benefit)
amsc_CashCashEquivalentsAndMarketableSecurities
Cash, Cash Equivalents, and Marketable Securities
Represents the amount of currency on hand as well as demand deposits with banks or financial institutions, and marketable securities.
amsc_ShelfRegistrationAmountAvailableForFutureOfferings
Shelf Registration, Amount Available for Future Offerings
Amount available for future offerings under the shelf registration.
us-gaap_OperatingExpenses
Total operating expenses
Performance-based Restricted Stock [Member]
Represents information pertaining to performance-based restricted stock.
Restricted cash
us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Restricted Cash and Cash Equivalents, Noncurrent
us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Restricted Cash and Cash Equivalents, Current
amsc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsPayableAndAccruedExpenses
Accounts payable and accrued expenses
Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables as well as accrued expenses, assumed at the acquisition date.
Equity-method investments
amsc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquityMethodInvestments
Amount of equity-method investments acquired at the acquisition date.
Cash and cash equivalents
Deferred Program Costs, increase for balance acquired
Represents increase/(decrease) in the assets for acquired contracts with customer from revenue recognized as deferred program costs from a business combination.
Unbilled AR, increase for balance acquired
Represents increase/(decrease) in the assets for acquired contracts with customer from revenue recognized on unbilled accounts receivable from a business combination.
amsc_BusinessCombinationContingentConsiderationArrangementsPaymentsToSettleRemainingObligations
Business Combination, Contingent Consideration Arrangements, Payments to Settle Remaining Obligations
Represents the payments to settle remaining obligations from a contingent consideration arrangement resulting from a business combination.
amsc_BusinessCombinationContingentConsiderationArrangementsRemainingObligationToStockholders
Business Combination, Contingent Consideration Arrangements, Remaining Obligation to Stockholders
Represents the remaining obligation to stockholders from a contingent consideration arrangement from a business combination.
Total stock-based compensation expense
Share-Based Payment Arrangement, Expense
amsc_PaymentsForRegistrationOfCommonStockShares
Cash paid related to registration of common stock shares
Represents payments for the registration of common stock shares.
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Change in fair value
NWL Pacific Inc. Co., LTD [Member]
Represents information pertaining to NWL Pacific Inc. Co., LTD.
Amendment Flag
us-gaap_ComprehensiveIncomeNetOfTax
Comprehensive income (loss)
City Area Code
us-gaap_IncreaseDecreaseInContractWithCustomerLiability
Deferred revenue
us-gaap_CommonStockSharesOutstanding
Balance (in shares)
Balance (in shares)
Current Fiscal Year End Date
Operating lease costs – variable
us-gaap_LeaseCost
Total lease costs
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses and other assets
Weighted-average discount rate
Document Fiscal Period Focus
Operating lease costs – fixed
Document Fiscal Year Focus
Short-term lease costs
Lease, Cost [Table Text Block]
Document Period End Date
Right-of-use assets obtained in exchange for new lease obligations
Weighted-average remaining lease term (Year)
Entity File Number
Entity Emerging Growth Company
Document Type
Proceeds from exercise of employee stock options and ESPP
Represents the proceeds from stock options and stock plans exercised.
Entity Small Business
Inox Wind Limited [Member]
Represents information pertaining to Inox Wind Limited.
Entity Shell Company
Document Information [Line Items]
Document Information [Table]
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Balance
Balance
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Settlement of contingent consideration
Entity Filer Category
Debt Instrument [Axis]
Entity Current Reporting Status
Debt Instrument, Name [Domain]
Restructuring
us-gaap_BusinessCombinationAcquisitionRelatedCosts
Business Combination, Acquisition Related Costs
amsc_RevenuePerformanceObligationSatisfiedRevenueRecognizedPercentage
Revenue, Performance Obligation Satisfied, Revenue Recognized, Percentage
Represents the percentage of revenue recognized at the point of time when control transferred to the customer.
amsc_ExtendedServiceWarrantyTerm
Extended Service Warranty, Term (Year)
Represents the additional term of extended service-type warranties.
amsc_WarrantyPeriod
Warranty Period (Year)
Represents the typical term of assurance-type warranties on all product sales.
us-gaap_GoodwillImpairmentLoss
Goodwill, Impairment Loss
us-gaap_IncreaseDecreaseInAccountsReceivable
Accounts receivable
Stock-based compensation expense
Inox Wind Limited
Statement of Comprehensive Income [Abstract]
Entity Tax Identification Number
Entity Central Index Key
amsc_ContractWithCustomerPaymentTerm
Contract with Customer, Payment Term (Day)
Represents the payment term, from the date of delivery, under contracts with customers.
Depreciation and amortization
Entity Registrant Name
Liability Class [Axis]
Fair Value by Liability Class [Domain]
Entity [Domain]
Customer Concentration Risk [Member]
Legal Entity [Axis]
Entity Address, Address Line One
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Grid [Member]
Represents information pertaining to the Grid segment.
us-gaap_AmortizationOfIntangibleAssets
Amortization of Intangible Assets
ecd_NonRule10b51ArrTrmntdFlag
Non-Rule 10b5-1 Arrangement Terminated [Flag]
us-gaap_TreasuryStockValueAcquiredCostMethod
Repurchase of treasury stock
Services and Technology Development [Member]
Represents information pertaining to services and technology development.
Entity Address, City or Town
ecd_Rule10b51ArrTrmntdFlag
Rule 10b5-1 Arrangement Terminated [Flag]
Equipment and Systems [Member]
Represents information pertaining to equipment and systems.
Amortization of acquisition-related intangibles
ecd_Rule10b51ArrAdoptedFlag
Rule 10b5-1 Arrangement Adopted [Flag]
Entity Address, Postal Zip Code
Entity Address, State or Province
ecd_NonRule10b51ArrAdoptedFlag
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Deferred program costs
Amount after valuation and LIFO reserves, and progress payments, of inventory associated with long-term contracts, expected to be sold, or consumed within one year or operating cycle, if longer.
Concentration Risk Type [Axis]
Material Terms of Trading Arrangement [Text Block]
Wind [Member]
Represents information pertaining to the Wind segment.
us-gaap_TreasuryStockValue
Treasury stock
Concentration Risk Type [Domain]
Entity Common Stock, Shares Outstanding
Accrued contract loss
represents the accrued contract loss.
Revenue Benchmark [Member]
Prepaid and Other Current Assets [Text Block]
Detail disclosure of prepaid and other current assets.
us-gaap_IncreaseDecreaseInInventories
Inventory
Trading Symbol
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Issuance of common stock - Megatran acquisition, net of offering expenses (in shares)
amsc_PercentageOfQualifiedWagesPaid
Percentage of Qualified Wages Paid
Represents percentage of qualified wages paid.
amsc_ContractWithCustomerAssetDeferredProgramCostsNet
Deferred Program Costs, ending balance
Deferred Program Costs, ending balance
Represents the net deferred program costs related to contract with customer.
Public Offering 2024 [Member]
Represents information pertaining to the 2024 public offering.
amsc_ContractWithCustomerAssetUnbilledARNet
Unbilled AR, ending balance
Ending balance as of September 30, 2024
Represents the net unbilled AR related to contract with customer.
Deferred Program Costs, increases for costs incurred to fulfill performance obligations
Represents the change in contract costs attributable to deferred program costs related to contract with customer.
Issuance of common stock – ESPP (in shares)
Issuance of common stock for 401(k) match
Local Phone Number
amsc_EmployeeRetentionCreditsBenefit
Employee Retention Credits Benefit
Represents employee retention credits benefit.
Issuance of common stock for 401(k) match (in shares)
amsc_EmployeeRetentionCreditsReceivable
Employee Retention Credits Receivable
Represents employee retention credits receivable.
Issuance of common stock - Megatran acquisition, net of offering expenses
Unbilled AR, increase (decrease) due to recognition of revenue based on transfer of control of performance obligations
Represents the change in the asset from the contract with customer from revenue recognized on unbilled accounts receivable.
us-gaap_TableTextBlock
Notes Tables
Deferred Program Costs, decrease due to cost recognition on completed performance obligations
Represents the amount of contract costs recognized from deferred program costs, with regard to asset from contract with customer.
Unbilled AR, increase (decrease) due to customer billings
Represents the revenue recognized from performance obligation satisfied from change in time frame of unbilled AR related to contract with customer.
Issuance of common stock – ESPP
Contract Liabilities, Other changes and foreign currency exchange impact
Represents other changes in the liability from contract with customer.
Deferred Program Costs, Other changes and foreign currency exchange impact
Represents the change in the asset from contract with customer, attributable to other changes in deferred program costs.
Other changes and FX impact
Represents changes in the asset from contract with customer from other changes pertaining to unbilled accounts receivable.
Issuance of common stock – restricted shares (in shares)
Issuance of common stock – restricted shares
us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)
Selling, general and administrative
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)
us-gaap_StockIssuedDuringPeriodSharesNewIssues
Stock Issued During Period, Shares, New Issues (in shares)
Raw materials
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and stockholders' equity
Finished goods
Work-in-process
Reported Value Measurement [Member]
Accumulated deficit
Retained Earnings (Accumulated Deficit)
Shares Tied to Derivative Liability [Member]
Represents the shares tied to the derivative liability.
Research and development
Thereafter
amsc_FinitelivedIntangibleAssetExpectedAmortizationAfterYearFour
Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).
Accumulated other comprehensive income
Backlog [Member]
Represents the information pertaining to backlog.
Measurement Input, Share Price [Member]
Debt Disclosure [Text Block]
Changes in operating asset and liability accounts:
Measurement Input, Revenue Risk Premium [Member]
Measurement input using revenue risk premium.
Measurement Input, Revenue Volatility [Member]
Measurement input using revenue volatility.
Measurement Input, Payment Delay [Member]
Measurement input using payment delay.
amsc_BusinessCombinationContingentConsiderationArrangementsNumberOfIssuableShares
Business Combination, Contingent Consideration Arrangements, Number of Issuable Shares (in shares)
The number of issuable shares for contingent consideration arrangements under business combinations.
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
us-gaap_OtherNoncashIncomeExpense
Other non-cash items
Inventory Disclosure [Text Block]
Lease liabilities – LT Operating
Schedule of Inventory, Current [Table Text Block]
Gray Construction, Inc. [Member]
Related to Gray Construction, Inc.
Present value of lease liabilities
Lease liabilities – ST Operating
Intangible assets, gross amount
us-gaap_IntangibleAssetsGrossExcludingGoodwill
Subsequent Events [Text Block]
Right-of-use assets
Right-of-use assets – Operating
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total minimum lease payments
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Less: interest
Deferred income taxes
2028
Measurement Input Type [Axis]
2025
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2029
Measurement Input Type [Domain]
2027
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2028
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Neeltran Inc. [Member]
Information related to Neeltran and International.
2029
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2026
2027
Business Combination, Contingent Consideration [Text Block]
The entire disclosure for contingent consideration for business combination.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
2026
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
amsc_OperatingAndFinanceLeaseRightofuseAsset
Total right-of-use assets
Amount of lessee's right to use underlying asset under both operating and finance lease.
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Other assets
us-gaap_ShareBasedCompensation
Stock-based compensation expense
2025
Estimated Useful Life (Year)
us-gaap_FiniteLivedIntangibleAssetUsefulLife
amsc_BusinessCombinationNumberOfEquipmentFinancingAgreementAssumed
Business Combination, Number of Equipment Financing Agreement Assumed
Represents number of equipment financing agreement assumed for business combination.
Equipment Financing Agreements Assumed In Business Acquisition [Member]
Represents equipment financing agreements assumed in business acquisition.
us-gaap_Revenues
Revenues
Operating expenses:
Schedule of Finite-Lived Intangible Assets [Table Text Block]
us-gaap_LesseeOperatingLeaseRenewalTerm
Lessee, Operating Lease, Renewal Term (Year)
Accounts Receivable [Text Block]
The entire disclosure for accounts receivable.
us-gaap_DepreciationDepletionAndAmortization
Depreciation, Depletion and Amortization
us-gaap_SharesIssuedPricePerShare
Shares Issued, Price Per Share (in dollars per share)
us-gaap_AssetsCurrent
Total current assets
Cash equivalents
Change in fair value of contingent consideration
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability
Interest income, net
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Common stock
Adjustments to reconcile net income (loss) to net cash provided by (used in) operations:
Measurement Frequency [Axis]
Measurement Frequency [Domain]
Fair Value, Recurring [Member]
Americas [Member]
us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Par or Stated Value Per Share (in dollars per share)
us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount
Asia Pacific [Member]
Statistical Measurement [Domain]
Maximum [Member]
Minimum [Member]
Product and Service [Axis]
Product and Service [Domain]
Statistical Measurement [Axis]
Investment, Name [Domain]
Investment, Name [Axis]
Property, Plant and Equipment Disclosure [Text Block]
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Geographical [Axis]
Property, Plant and Equipment [Table Text Block]
Geographical [Domain]
Inventory, net
Net inventory
Portion at Fair Value Measurement [Member]
Accrued inventories in-transit
Represents the amount of accrued inventories in transit, as of the balance sheet date.
Equipment and Software [Member]
Represents information pertaining to equipment and software.
Assets And Liabilities Lessee [Table Text Block]
Tabular disclosure of lessee's assets and liabilities.
EMEA [Member]
Revenues
Measurement Basis [Axis]
Fair Value, Inputs, Level 3 [Member]
Fair Value Hierarchy and NAV [Domain]
Customer [Axis]
Fair Value, Inputs, Level 1 [Member]
Customer [Domain]
Fair Value, Inputs, Level 2 [Member]
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
Fair Value Hierarchy and NAV [Axis]
us-gaap_ProductWarrantyAccrualPayments
Settlements during the period
Acquired warranty obligations
amsc_ShelfRegistrationMaximumAmountToBeSold
Shelf Registration, Maximum Amount to be Sold
Maximum amount to be sold under the shelf registration.
Provisions for warranties during the period
Construction in Progress [Member]
Cash flows from operating activities:
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Statement [Line Items]
us-gaap_NumberOfOperatingSegments
Number of Operating Segments
Accounts receivable, net
Accounts receivable
Furniture and Fixtures [Member]
us-gaap_NumberOfReportableSegments
Number of Reportable Segments
Building [Member]
Additional paid-in capital
AOCI Attributable to Parent [Member]
Schedule of Product Warranty Liability [Table Text Block]
Stockholders' equity:
Land [Member]
Leasehold Improvements [Member]
Other expense, net
Long-Lived Tangible Asset [Axis]
Segment Reporting Disclosure [Text Block]
Long-Lived Tangible Asset [Domain]
Current assets:
Fair Value Disclosures [Text Block]
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash, cash equivalents and restricted cash at beginning of period
Cash, cash equivalents and restricted cash at end of period
Effect of exchange rate changes on cash
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Net decrease in cash, cash equivalents and restricted cash
us-gaap_Liabilities
Total liabilities
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash (used in) provided by financing activities
Commitments and Contingencies (Note 18)
Sale of Stock [Axis]
Sale of Stock [Domain]
Increase (decrease) due to customer billings
us-gaap_OperatingIncomeLoss
Operating loss
Operating Income (loss)
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net Cash Provided by (Used in) Operating Activities
Net cash provided by (used in) operating activities
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations
Contract Liabilities, increase for balance acquired
Prepaid expenses and other current assets
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash used in investing activities
us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Deferred Tax Liabilities, Intangible Assets
Cost of revenues
Cost of Revenue
us-gaap_GrossProfit
Gross Profit
Gross margin
Consolidation Items [Domain]
Deferred tax liabilities, long-term portion
Provision for excess and obsolete inventory
Inventory Write-down
us-gaap_ContractWithCustomerLiability
Contract Liabilities, ending balance
Contract Liabilities, ending balance
Consolidation Items [Axis]
Equity Method Investments and Joint Ventures Disclosure [Text Block]
Equity Method Investments [Table Text Block]
us-gaap_ProductWarrantyAccrual
Balance at beginning of period
Balance at end of period
Accounts receivable (billed)
us-gaap_PaymentsForRepurchaseOfCommonStock
Repurchase of treasury stock
Accounts Receivable [Table Text Block]
Tabular disclosure of accounts receivable.
Retained Earnings [Member]
amsc_BusinessAcquisitionProFormaOperatingIncomeLoss
Operating income (loss)
The pro forma operating Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.
us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from Issuance of Common Stock
Treasury Stock, Common [Member]
Additional Paid-in Capital [Member]
Common Stock [Member]
Equity Components [Axis]
Equity Component [Domain]
Prepaid Expenses and Other Current Assets [Member]
us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)
us-gaap_RevenueRemainingPerformanceObligation
Revenue, Remaining Performance Obligation, Amount
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Loss before income tax expense (benefit)
Other comprehensive (loss) gain, net of tax:
Disaggregation of Revenue [Table Text Block]
us-gaap_RepaymentsOfLongTermDebt
Repayment of debt
Revenue from Contract with Customer [Text Block]
Total lease liabilities
Present value of lessee's discounted obligation for lease payments from operating and finance leases.
Statement of Financial Position Location, Balance [Axis]
Statement of Financial Position Location, Balance [Domain]
Document Quarterly Report
Entity Incorporation, State or Country Code
us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits
Accounting Policies [Abstract]
Lease liability, current portion
amsc_LeaseLiabilityCurrent
The amount of lease liability of both operating and financing leases, classified as current.
Document Transition Report
Lease liability, long-term portion
amsc_LeaseLiabilityNoncurrent
The amount of lease liability of both operating and financing leases, classified as noncurrent.
Selling, General and Administrative Expenses [Member]
Entity Interactive Data Current
Security Exchange Name
Title of 12(b) Security
Equity Method Investment, Nonconsolidated Investee [Axis]
Cost of Sales [Member]
Equity Method Investment, Nonconsolidated Investee [Domain]
Research and Development Expense [Member]
Statement of Income Location, Balance [Axis]
Statement of Income Location, Balance [Domain]
Advanced deposits
Segments [Axis]
Segments [Domain]
us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)
Shares used in per-share calculation - diluted (in shares)
us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted (in shares)
Accounts receivable (unbilled)
Statement [Table]
Core Technology and Know-how [Member]
Represents information pertaining to Core Technology and Know-how.
Statement of Financial Position [Abstract]
Net income (loss) per share - diluted (in dollars per share)
Diluted (in dollars per share)
Shares used in per-share calculation - basic (in shares)
us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic (in shares)
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
Business Acquisition [Axis]
Net income (loss) per share - basic (in dollars per share)
Basic (in dollars per share)
Business Acquisition, Acquiree [Domain]
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
Weighted average number of common shares outstanding
Statement of Cash Flows [Abstract]
Statement of Stockholders' Equity [Abstract]
Income Statement [Abstract]
us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Total other comprehensive (loss) gain, net of tax
Employee Stock Purchase Plan [Member]
Represents the information pertaining to employee stock purchase plan.
Contingent consideration
amsc_GainLossInChangeOfFairValueOfContingentConsideration
Gain (Loss) in Change of Fair Value of Contingent Consideration
Gain (loss) related to the change of fair value of contingent consideration.
amsc_ExtendedWarrantyTriggerPeriod
Extended Warranty Trigger Period (Year)
The period in which customers may extend their warranty for an additional term.
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)
us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentInventory
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory
Immediately Vested Common Stock [Member]
Represents common stock which is vested immediately upon issuance.
Accounting Standards Update and Change in Accounting Principle [Text Block]
us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Change in other assets
Cash flows from financing activities:
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Other liabilities
amsc_BusinessCombinationSharePurchasePriceQuotientAmount
Business Combination, Share Purchase Price Quotient Amount
The amount of share purchase price quotient amount for business combination.
amsc_BusinessCombinationMaximumAdjustmentBeforeIndebtedness
Business Combination, Maximum Adjustment Before Indebtedness
The maximum adjustment amount before indebtedness for a business combination.
us-gaap_PaymentForContingentConsiderationLiabilityInvestingActivities
Payment for Contingent Consideration Liability, Investing Activities
Cash paid to settle Megatran contingent consideration liability
us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount
Business Combination, Acquired Receivables, Gross Contractual Amount
us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible
Business Combination, Acquired Receivables, Estimated Uncollectible
amsc_BusinessAcquisitionProFormaSharesBasic
Shares - basic (in shares)
The pro forma basic shares for a period as if the business combination or combinations had been completed at the beginning of a period.
amsc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssetsLiabilities
Net tangible assets/(liabilities)
Amount recognized as of the acquisition date for the identifiable tangible assets acquired in excess of (less than) the aggregate liabilities assumed.
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Megatran [Member]
Related to Megatran.
us-gaap_BusinessCombinationAcquiredReceivablesFairValue
Business Combination, Acquired Receivable, Fair Value
amsc_BusinessCombinationPotentialAdditionalCashPayment
Business Combination, Potential Additional Cash Payment
The amount of potential additional cash payment for business combination.
amsc_BusinessAcquisitionProFormaSharesDiluted
Shares - diluted (in shares)
The pro forma diluted shares for a period as if the business combination or combinations had been completed at the beginning of a period.
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
Total purchase consideration
Deferred revenue, long-term portion
us-gaap_StockholdersEquity
Total stockholders' equity
Balance
Balance
Amortization of operating lease right-of-use assets
us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Cash paid for Megatran Acquisition, net of cash acquired
us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Property, plant and equipment, net
us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization
Less accumulated depreciation
Class of Stock [Axis]
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities
Deferred tax liability
Property, plant and equipment, gross
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue
Deferred revenue
Cash payments
Payments to Acquire Businesses, Gross
Operating Segments [Member]
Derivative Financial Instruments, Liabilities [Member]
Property, plant, and equipment
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment