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Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Mar. 31, 2015
Statement Of Financial Position [Abstract]
Note payable, Unamortized Discount, Current	$ 136	$ 244
Note payable, Unamortized Discount, Noncurrent	$ 191	$ 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

X

- References

No definition available.

+ Details

Name:	us-gaap_StatementOfFinancialPositionAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration