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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Mar. 31, 2013
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Statement Of Financial Position [Abstract] |  |
Note payable, current portion, net of discount | $ 363 | $ 458
Current portion of convertible note, net of discount | 3,259 | 4,289
Note payable, net of current portion and discount | 39 | 95
Convertible note net of current portion and discount | $ 172 | $ 600

X
- Definition Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable net of discount. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References No definition available. + Details
Name: | amsc_ConvertibleNotesPayableCurrentNet
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion, net of discount. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References No definition available. + Details
Name: | amsc_ConvertibleNotesPayableNoncurrentNet
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer net of discounts. + References No definition available. + Details
Name: | amsc_NotesPayableCurrentNet
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion, net of discount. + References No definition available. + Details
Name: | amsc_NotesPayableNoncurrentNet
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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