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Accounts Payable and Accrued Expenses - Additional Information (Detail)	9 Months Ended
	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: