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Business Segments (Customers Who Represented 10% Or More Of The Company's Total Revenues) (Details)	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Maximum [Member] | Department Of Energy [Member]
Revenue, percentage		10.00%
Maximum [Member] | Doosan Heavy Industries & Construction Co Ltd. [Member]
Revenue, percentage		10.00%
Maximum [Member] | Shenyang Blower Works Group Wind Power Co.,Ltd. [Member]
Revenue, percentage		10.00%
Department Of Energy [Member]
Revenue, percentage	17.00%
Doosan Heavy Industries & Construction Co Ltd. [Member]
Revenue, percentage	15.00%
Shenyang Blower Works Group Wind Power Co.,Ltd. [Member]
Revenue, percentage	13.00%
Sinovel Wind Co., Ltd [Member]
Revenue, percentage		72.00%

X

- Definition

The percentage of net product revenue to total net revenue from the sale of goods as of year end.

+ Details

Name:	amsc_SalesRevenueGoodsNetPercentage
Namespace Prefix:	amsc
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration