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Business Segments - Operating Results for Two Business Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 21,250 us-gaap_SalesRevenueNet | $ 20,563 us-gaap_SalesRevenueNet | $ 45,401 us-gaap_SalesRevenueNet | $ 67,830 us-gaap_SalesRevenueNet
Operating profit (loss) | (7,735)us-gaap_OperatingIncomeLoss | (6,675)us-gaap_OperatingIncomeLoss | (46,801)us-gaap_OperatingIncomeLoss | (26,552)us-gaap_OperatingIncomeLoss
Unallocated corporate expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating profit (loss) | (1,986)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | (3,072)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | (9,995)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | (8,058)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Wind |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 15,131 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember | 13,545 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember | 30,244 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember | 42,937 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember
Wind | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating profit (loss) | 1,301 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember | 1,067 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember | (16,790)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember | (3,207)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_WindMember
Grid |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 6,119 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember | 7,018 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember | 15,157 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember | 24,893 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember
Grid | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating profit (loss) | $ (7,050)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember | $ (4,670)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember | $ (20,016)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember | $ (15,287)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember

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- 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 + Details
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