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Intangible Assets - Schedule of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Mar. 31, 2015 | Mar. 31, 2014
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Amount | $ 9,280 us-gaap_FiniteLivedIntangibleAssetsGross | $ 10,209 us-gaap_FiniteLivedIntangibleAssetsGross
Intangible assets, Accumulated Amortization | (7,858)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (8,214)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets, Net Book Value | 1,422 us-gaap_FiniteLivedIntangibleAssetsNet | 1,995 us-gaap_FiniteLivedIntangibleAssetsNet
Licenses |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Amount | 4,422 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 4,473 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Intangible assets, Accumulated Amortization | (3,328)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | (2,962)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Intangible assets, Net Book Value | 1,094 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 1,511 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Intangible assets, Estimated Useful Life | 7 years |
Core Technology And Know How |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Amount | 4,858 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = amsc_CoreTechnologyAndKnowHowMember | 5,736 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = amsc_CoreTechnologyAndKnowHowMember
Intangible assets, Accumulated Amortization | (4,530)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = amsc_CoreTechnologyAndKnowHowMember | (5,252)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = amsc_CoreTechnologyAndKnowHowMember
Intangible assets, Net Book Value | $ 328 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = amsc_CoreTechnologyAndKnowHowMember | $ 484 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = amsc_CoreTechnologyAndKnowHowMember
Core Technology And Know How | Minimum |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, Estimated Useful Life | 5 years |
Core Technology And Know How | Maximum |  |
Finite Lived Intangible Assets [Line Items] |  |
Intangible assets, Estimated Useful Life | 10 years |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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