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v2.4.0.8

Accounts Payable and Accrued Expenses - Additional Information (Detail) | 3 Months Ended
--- | ---
Jun. 30, 2013
Minimum [Member] |
Product Warranty Accrual [Line Items] |
Warranty period | 1 year
Maximum [Member] |
Product Warranty Accrual [Line Items] |
Warranty period | 3 years

X
- Details
Name: | amsc_ProductWarrantyAccrualLineItems
Namespace Prefix: | amsc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warranty period. + References No definition available. + Details
Name: | amsc_WarrantyPeriod
Namespace Prefix: | amsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration