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Business Segments (Schedule Of Customers Who Represented 10% Or More Of The Company's Total Revenues) (Details)	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Inox Wind, Ltd. [Member]
Entity-Wide Revenue, Major Customer [Line Items]
Revenue, percentage	27.00%	10.00%	21.00%	10.00%
Doosan Heavy Industries & Construction Co Ltd. [Member]
Entity-Wide Revenue, Major Customer [Line Items]
Revenue, percentage	12.00%	10.00%	15.00%	10.00%
Ergon Energy Corporation Limited [Member]
Entity-Wide Revenue, Major Customer [Line Items]
Revenue, percentage	11.00%		10.00%
Vestas - Australian Wind Technology Ltd [Member]
Entity-Wide Revenue, Major Customer [Line Items]
Revenue, percentage	10.00%	44.00%	10.00%	10.00%
Hyundai Heavy Industries Co., Ltd. [Member]
Entity-Wide Revenue, Major Customer [Line Items]
Revenue, percentage	10.00%	10.00%	10.00%	10.00%
Shenyang Blower Works Group Co., Ltd. [Member]
Entity-Wide Revenue, Major Customer [Line Items]
Revenue, percentage	10.00%	11.00%	10.00%	10.00%
Sinovel Wind Co., Ltd [Member]
Entity-Wide Revenue, Major Customer [Line Items]
Revenue, percentage				66.00%

X

- Definition

Sales revenue goods, percentage.

+ References

No definition available.

+ Details

Name:	amsc_SalesRevenueGoodsPercentage
Namespace Prefix:	amsc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration