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Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013
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Fair Value Disclosures [Abstract] |
Amount of additional convertible notes and warrants | $ 15.0

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- Definition Derivative liability additional convertible notes and warrants. + 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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- Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration