XML 55 R44.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Accounts Payable and Accrued Expenses - Additional Information (Detail) | 6 Months Ended
--- | ---
Sep. 30, 2016
Minimum |
Product Warranty Liability [Line Items] |
Warranty period | 1 year
Maximum |
Product Warranty Liability [Line Items] |
Warranty period | 3 years

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
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ProductWarrantyLiabilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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