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Marketable Securities And Fair Value Disclosures (Schedule Of The Major Classes Of Liabilities Measured At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013
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Derivative Liability [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
April 1, 2012 | $ 529
Valuation of original derivative liability | 3,779
Valuation of derivative liability attributable to modification | 542
Mark to market adjustment | (3,792)
Balance at March 31, 2013 | 529
Warrants [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
April 1, 2012 | 3,633
Warrant issuance with Senior Convertible Note | 7,018
Warrant issuance with Senior Secured Term Loan | 380
Mark to market adjustment | (3,765)
Balance at March 31, 2013 | $ 3,633

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- Definition Fair value disclosure, issuance of warrants with convertible notes. + References No definition available. + Details
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Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value disclosure, issuance of warrants with secured term loan. + References No definition available. + Details
Name: | amsc_FairValueDisclosureIssuanceOfWarrantsWithSecuredTermLoan
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
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- Definition Fair value disclosure, mark to market adjustment. + References No definition available. + Details
Name: | amsc_FairValueDisclosureMarkToMarketAdjustment
Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value disclosure, valuation of derivative liability. + References No definition available. + Details
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Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value disclosure, valuation of derivative liability attributable to modification. + References No definition available. + Details
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Namespace Prefix: | amsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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Namespace Prefix: | us-gaap_
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- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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