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Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2015 | Mar. 31, 2015
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Statement Of Financial Position [Abstract] |  |
Note payable, Unamortized Discount, Current | $ 83 | $ 244
Note payable, Unamortized Discount, Noncurrent | $ 161 | $ 290

X
- Definition Current portion of unamortized debt discount. + References No definition available. + Details
Name: | amsc_CurrentPortionOfUnamortizedDebtDiscount
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Noncurrent portion of unamortized debt discount. + References No definition available. + Details
Name: | amsc_NoncurrentPortionOfUnamortizedDebtDiscount
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_StatementOfFinancialPositionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration