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Commitments And Contingencies (Narrative) (Details)
 1 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 3 Months Ended
Jun. 17, 2011
May 12, 2011
Jun. 30, 2012
USD ($)
Mar. 31, 2010
USD ($)
Mar. 31, 2012
USD ($)
sqft
Mar. 31, 2011
USD ($)
Mar. 31, 2010
USD ($)
Mar. 31, 2012
Chinese Yen Line Of Credit [Member]
EUR (€)
Mar. 31, 2012
Euro Line Of Credit [Member]
USD ($)
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 (€)
Mar. 31, 2012
Minimum [Member]
Mar. 31, 2012
Maximum [Member]
Jun. 30, 2012
Letter of Credit [Member]
USD ($)
Commitments And Contingencies [Line Items]                                                        
Adverse purchase commitments         $ 25,894,000 $ 38,763,000                                            
Losses (recoveries) of commitments to purchase materials       38,800,000                                                
Losses On Purchase Commitments         (1,299,000) 38,763,000                                            
Potential loss, minimum         0                                              
Potential loss, maximum         4,000,000                                              
Total space leased, square feet         299,000                                              
Leases expiration dates                                                   April 2012 February 2016  
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         5                                              
Total value of outstanding performance bonds         800,000                                              
Restricted cash included in current assets         12,086,000 5,566,000                                            
Restricted cash included in long-term assets         2,540,000                                              
Borrowing capacity     9,000,000                                                 9,000,000
Change in restricted cash     8,500,000   9,093,000 (247,000) (1,602,000)                                         8,500,000
Reduction of adverse purchase commitments liability     7,400,000                                                 7,400,000
Unused, unsecured lines of credit               2,300,000 3,100,000                                      
Lines of credit facility repaid         $ 4,600,000