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Commitments And Contingencies (Narrative) (Details)
 1 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended
Jun. 17, 2011
May 12, 2011
Jun. 30, 2012
USD ($)
Jun. 30, 2011
USD ($)
Mar. 31, 2012
USD ($)
Dec. 22, 2011
Sinovel Wind Group Co. Ltd. [Member]
USD ($)
Dec. 22, 2011
Sinovel Wind Group 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 ($)
Mar. 31, 2011
Sinovel Wind Group Co. Ltd. [Member]
CNY
Sep. 16, 2011
Dalian Guotong Electric Co. Ltd. [Member]
USD ($)
Sep. 16, 2011
Dalian Guotong Electric Co. Ltd. [Member]
CNY
May 12, 2011
AMSC Windtec [Member]
USD ($)
May 12, 2011
AMSC Windtec [Member]
EUR (€)
Jun. 30, 2012
Letter of Credit [Member]
USD ($)
Commitments And Contingencies [Line Items]                                            
Adverse purchase commitments     $ 17,500,000                                      
Accrual for adverse purchase commitments     7,300,000                                      
Losses On Purchase Commitments     (7,301,000) 1,071,000                                    
Potential loss, minimum     0                                      
Potential loss, maximum     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           190,000,000 1,200,000,000     157,000,000 1,000,000,000 58,000,000 370,000,000             24,000,000 18,000,000  
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                           6,000,000 38,000,000     200,000 1,200,000      
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     16,684,000   12,086,000                                  
Restricted cash included in long-term assets     4,767,000   2,540,000                                  
Borrowing capacity                                           9,000,000
Change in restricted cash     6,858,000 3,763,000                                   8,500,000
Reduction of adverse purchase commitments liability                                           $ 7,300,000