XML 80 R60.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Business Segments - Operating Results for Two Business Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 25,772 | $ 21,250 | $ 68,499 | $ 45,401
Operating (loss) profit | (3,312) | (7,735) | (18,411) | (46,801)
Unallocated corporate expenses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating (loss) profit | (707) | (1,986) | (3,321) | (9,995)
Wind |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 17,229 | 15,131 | 48,976 | 30,244
Wind | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating (loss) profit | (263) | 1,301 | (2,127) | (16,790)
Grid |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 8,543 | 6,119 | 19,523 | 15,157
Grid | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating (loss) profit | $ (2,342) | $ (7,050) | $ (12,963) | $ (20,016)

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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 + Details
Name: | us-gaap_SalesRevenueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=amsc_WindMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=amsc_GridMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |