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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Payables And Accruals [Abstract]      
Accounts payable $ 7,062us-gaap_AccountsPayableCurrent $ 1,749us-gaap_AccountsPayableCurrent  
Accrued inventories in-transit 1,127amsc_AccruedInventoriesInTransit 212amsc_AccruedInventoriesInTransit  
Accrued miscellaneous expenses 2,695us-gaap_OtherAccruedLiabilitiesCurrent 5,935us-gaap_OtherAccruedLiabilitiesCurrent  
Accrued outside services 582amsc_AccruedOutsideServices 3,716amsc_AccruedOutsideServices  
Accrued subcontractor program costs   290us-gaap_AccruedProfessionalFeesCurrent  
Accrued compensation 5,937us-gaap_EmployeeRelatedLiabilitiesCurrent 6,080us-gaap_EmployeeRelatedLiabilitiesCurrent  
Income taxes payable 278us-gaap_AccruedIncomeTaxesCurrent 173us-gaap_AccruedIncomeTaxesCurrent  
Accrued adverse purchase commitments   402us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted  
Accrued warranty 3,934us-gaap_ProductWarrantyAccrualClassifiedCurrent 3,207us-gaap_ProductWarrantyAccrualClassifiedCurrent 2,709us-gaap_ProductWarrantyAccrualClassifiedCurrent
Total $ 21,615us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 21,764us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent