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Commitments And Contingencies (Narrative) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Jun. 17, 2011
claim
May 12, 2011
claim
employee
Sep. 30, 2012
USD ($)
Mar. 31, 2012
USD ($)
plaintiff
Sep. 30, 2012
USD ($)
Sep. 30, 2011
USD ($)
May 12, 2011
AMSC Windtec [Member]
USD ($)
May 12, 2011
AMSC Windtec [Member]
EUR (€)
Sep. 16, 2011
Dalian Guotong Electric Co. Ltd. [Member]
USD ($)
Sep. 16, 2011
Dalian Guotong Electric Co. Ltd. [Member]
CNY
Dec. 22, 2011
Sinovel Wind Group Co. Ltd. [Member]
USD ($)
Dec. 22, 2011
Sinovel Wind Group Co. Ltd. [Member]
CNY
Oct. 17, 2011
Sinovel Wind Group Co. Ltd. [Member]
USD ($)
Oct. 17, 2011
Sinovel Wind Group Co. Ltd. [Member]
CNY
Oct. 08, 2011
Sinovel Wind Group Co. Ltd. [Member]
USD ($)
Oct. 08, 2011
Sinovel Wind Group Co. Ltd. [Member]
CNY
Sep. 13, 2011
Sinovel Wind Group Co. Ltd. [Member]
USD ($)
Sep. 13, 2011
Sinovel Wind Group Co. Ltd. [Member]
CNY
Mar. 31, 2011
Sinovel Wind Group Co. Ltd. [Member]
USD ($)
Mar. 31, 2011
Sinovel Wind Group Co. Ltd. [Member]
CNY
Sep. 30, 2012
Letter of Credit [Member]
USD ($)
Jun. 30, 2012
Letter of Credit [Member]
USD ($)
Sep. 30, 2012
Letter of Credit [Member]
USD ($)
Commitments And Contingencies [Line Items]                                              
Adverse purchase commitments     $ 12,100,000   $ 12,100,000                                    
Accrual for adverse purchase commitments     1,000,000   8,300,000                                    
Losses On Purchase Commitments         (8,309,000) 167,000                                  
Potential loss, minimum     0   0                                    
Potential loss, maximum     4,000,000   4,000,000                                    
Number of putative securities complaints 4 7                                          
Number of officers putative securities filed against   2                                          
Number of complaints additionally asserted claims against the underwriters   1                                          
Claim amount per request for arbitration             24,000,000 18,000,000     190,000,000 1,200,000,000 157,000,000 1,000,000,000 58,000,000 370,000,000              
Monetary damages due to breaches of contracts                                     76,000,000 485,000,000      
Value of the undelivered components                                     720,000,000 4,600,000,000      
Net amount of damages claimed                     17,000,000 105,000,000                      
Damages claimed for unauthorized use of software                 200,000 1,200,000             6,000,000 38,000,000          
Monetary damages for trade secret infringement                                 453,000,000 2,900,000,000          
Counterclaims under License Agreement             9,000,000 6,000,000                              
Number of outstanding performance bonds         3                                    
Total value of outstanding performance bonds     3,500,000                                        
Restricted cash included in current assets     13,620,000 12,086,000 13,620,000                                    
Restricted cash included in long-term assets     5,142,000 2,540,000 5,142,000                                    
Borrowing capacity                                           9,000,000  
Change in restricted cash         4,116,000 3,781,000                               8,500,000  
Reduction of adverse purchase commitments liability                                         1,000,000   8,300,000
Number of vendors filing suits       3                                      
Number of claims consolidated 3                                            
Adverse purchase commitments     $ (12,080,000) $ (25,894,000) $ (12,080,000)