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Business Segments - Schedule of Revenues by Major Customers (Detail) (Total Revenue, Customer Concentration Risk)
 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Inox Wind Limited
        
Segment Reporting Asset Reconciling Item [Line Items]        
Revenue percentage 61.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amsc_InoxWindLimitedMember		 35.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amsc_InoxWindLimitedMember		 54.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amsc_InoxWindLimitedMember		 25.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amsc_InoxWindLimitedMember
Beijing Jingcheng New Energy Company Limited
        
Segment Reporting Asset Reconciling Item [Line Items]        
Revenue percentage       22.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amsc_BeijingJingchengNewEnergyCompanyLimitedMember
Beijing Jingcheng New Energy Company Limited | Maximum
        
Segment Reporting Asset Reconciling Item [Line Items]        
Revenue percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amsc_BeijingJingchengNewEnergyCompanyLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amsc_BeijingJingchengNewEnergyCompanyLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amsc_BeijingJingchengNewEnergyCompanyLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
CSR Zhuzhou Institute Company Limited
        
Segment Reporting Asset Reconciling Item [Line Items]        
Revenue percentage   18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amsc_CsrZhuzhouInstituteCompanyLimitedMember		    
CSR Zhuzhou Institute Company Limited | Maximum
        
Segment Reporting Asset Reconciling Item [Line Items]        
Revenue percentage       10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= amsc_CsrZhuzhouInstituteCompanyLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember