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Business Segment and Geographic Information - Operating Results for Two Business Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 25,129us-gaap_SalesRevenueNet	$ 21,250us-gaap_SalesRevenueNet	$ 12,455us-gaap_SalesRevenueNet	$ 11,696us-gaap_SalesRevenueNet	$ 16,287us-gaap_SalesRevenueNet	$ 20,563us-gaap_SalesRevenueNet	$ 24,181us-gaap_SalesRevenueNet	$ 23,086us-gaap_SalesRevenueNet	$ 70,530us-gaap_SalesRevenueNet	$ 84,117us-gaap_SalesRevenueNet	$ 87,419us-gaap_SalesRevenueNet
Operating loss	(5,715)us-gaap_OperatingIncomeLoss	(7,735)us-gaap_OperatingIncomeLoss	(26,400)us-gaap_OperatingIncomeLoss	(12,667)us-gaap_OperatingIncomeLoss	(14,876)us-gaap_OperatingIncomeLoss	(6,675)us-gaap_OperatingIncomeLoss	(11,028)us-gaap_OperatingIncomeLoss	(8,850)us-gaap_OperatingIncomeLoss	(52,517)us-gaap_OperatingIncomeLoss	(41,429)us-gaap_OperatingIncomeLoss	(57,741)us-gaap_OperatingIncomeLoss
Unallocated corporate expenses
Segment Reporting Information [Line Items]
Operating loss									(11,306)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	(13,693)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	(17,828)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Wind
Segment Reporting Information [Line Items]
Revenues									51,307us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember	55,608us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember	44,231us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember
Wind | Operating Segments
Segment Reporting Information [Line Items]
Operating loss									(14,321)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember	(5,213)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember	(16,098)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember
Grid
Segment Reporting Information [Line Items]
Revenues									19,223us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember	28,509us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember	43,188us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember
Grid | Operating Segments
Segment Reporting Information [Line Items]
Operating loss									$ (26,890)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember	$ (22,523)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember	$ (23,815)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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