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Valuation And Qualifying Accounts
 12 Months Ended
Mar. 31, 2012
Valuation And Qualifying Accounts [Abstract]  
Valuation And Qualifying Accounts

American Superconductor Corporation
Schedule II—Valuation and Qualifying Accounts
(In thousands)
 
    Balance,       Recoveries and     Balance,
    Beginning of       Other     End of
    Year Additions Write-offs   Adjustments     Year
Allowance for doubtful accounts receivable:              
Fiscal year ended March 31, 2012 $ 683 6 (631 ) (6 ) $ 52
Fiscal year ended March 31, 2011   766 28 (118 ) 7     683
Fiscal year ended March 31, 2010   1,343 286 (54 ) (809 )   766
 
    Balance,             Balance,
    Beginning of             End of
    Year Additions Expirations   Adjustments     Year
Deferred tax asset valuation allowance:                  
Fiscal year ended March 31, 2012 $ 220,596 41,709 (10,003 ) –   $ 252,302
Fiscal year ended March 31, 2011   187,358 43,308 (10,063 ) (7 )   220,596
Fiscal year ended March 31, 2010   174,695 16,189 (4,148 ) 622     187,358