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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Income Statement [Abstract]      
Revenues $ 70,530us-gaap_SalesRevenueNet $ 84,117us-gaap_SalesRevenueNet $ 87,419us-gaap_SalesRevenueNet
Cost and operating expenses:      
Cost of revenues 67,442us-gaap_CostOfRevenue 72,858us-gaap_CostOfRevenue 71,937us-gaap_CostOfRevenue
Research and development 11,878us-gaap_ResearchAndDevelopmentExpense 12,173us-gaap_ResearchAndDevelopmentExpense 15,325us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 29,217us-gaap_SellingGeneralAndAdministrativeExpense 37,230us-gaap_SellingGeneralAndAdministrativeExpense 49,652us-gaap_SellingGeneralAndAdministrativeExpense
Arbitration award expense 8,987us-gaap_LitigationSettlementAmount    
Restructuring and impairments 5,366us-gaap_RestructuringSettlementAndImpairmentProvisions 2,998us-gaap_RestructuringSettlementAndImpairmentProvisions 7,922us-gaap_RestructuringSettlementAndImpairmentProvisions
Amortization of acquisition related intangibles 157us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense 287us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense 324us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
Total operating expenses 123,047us-gaap_CostsAndExpenses 125,546us-gaap_CostsAndExpenses 145,160us-gaap_CostsAndExpenses
Operating loss (52,517)us-gaap_OperatingIncomeLoss (41,429)us-gaap_OperatingIncomeLoss (57,741)us-gaap_OperatingIncomeLoss
Change in fair value of derivatives and warrants 3,963amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants 1,872amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants 7,556amsc_GainLossInChangeOfFairValueOfDerivativeInstrumentsAndWarrants
Loss on extinguishment of debt   (5,197)us-gaap_GainsLossesOnExtinguishmentOfDebt  
Interest expense, net (1,882)us-gaap_InterestIncomeExpenseNonoperatingNet (9,661)us-gaap_InterestIncomeExpenseNonoperatingNet (14,948)us-gaap_InterestIncomeExpenseNonoperatingNet
Other income (expense), net 1,596us-gaap_OtherNonoperatingIncomeExpense (991)us-gaap_OtherNonoperatingIncomeExpense (1,262)us-gaap_OtherNonoperatingIncomeExpense
Loss before income tax (benefit) expense (48,840)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (55,406)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (66,395)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax (benefit) expense (184)us-gaap_IncomeTaxExpenseBenefit 852us-gaap_IncomeTaxExpenseBenefit (264)us-gaap_IncomeTaxExpenseBenefit
Net loss $ (48,656)us-gaap_NetIncomeLoss $ (56,258)us-gaap_NetIncomeLoss $ (66,131)us-gaap_NetIncomeLoss
Net loss per common share      
Basic $ (5.74)us-gaap_EarningsPerShareBasic $ (8.98)us-gaap_EarningsPerShareBasic $ (12.46)us-gaap_EarningsPerShareBasic
Diluted $ (5.74)us-gaap_EarningsPerShareDiluted $ (8.98)us-gaap_EarningsPerShareDiluted $ (12.46)us-gaap_EarningsPerShareDiluted
Weighted average number of common shares outstanding      
Basic 8,477us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 6,262us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 5,307us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 8,477us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 6,262us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 5,307us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding