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Commitments And Contingencies (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended
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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

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