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Intangible Assets - Schedule of Business Segment Composition of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014
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Intangibles, net | $ 1,422 us-gaap_IntangibleAssetsNetExcludingGoodwill | $ 1,995 us-gaap_IntangibleAssetsNetExcludingGoodwill
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Intangibles, net | $ 1,422 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember | $ 1,995 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = amsc_GridMember

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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