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v2.4.1.9

Accounts Payable and Accrued Expenses - Additional Information (Detail) | 9 Months Ended
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Dec. 31, 2014
Minimum |
Product Warranty Accrual [Line Items] |
Warranty period | 1 year
Maximum |
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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |