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Commitments And Contingencies (Narrative) (Details) | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended
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May 17, 2013 USD ($) | Jul. 05, 2011 claim | Jun. 17, 2011 claim | May 12, 2011 employee claim | Mar. 31, 2013 USD ($) sqft | Mar. 31, 2012 USD ($) | Mar. 31, 2013 EUR (€) | Feb. 27, 2012 Sinovel Wind Group Co. Ltd. [Member] USD ($) | Feb. 27, 2012 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 Ghodawat Energy Pvt Ltd [Member] USD ($) | May 12, 2011 Ghodawat Energy Pvt Ltd [Member] EUR (€)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adverse purchase commitments |  |  |  |  | $ 1,440,000 | $ 25,894,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted accrual for adverse purchase commitments |  |  |  |  | 7,800,000 | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total space leased, square feet |  |  |  |  | 316,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency | 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims consolidated |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sought compensation amount |  |  |  |  |  |  |  | 17,000,000 | 105,000,000,000 | 190,000,000 | 1,200,000,000 | 157,000,000 | 1,000,000,000 | 58,000,000 | 370,000,000 |  |  | 76,000,000 | 485,000,000 |  |  | 24,000,000 | 18,000,000
Value of the undelivered components |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 720,000,000 | 4,600,000,000 |  |  |  |
Damages claimed for unauthorized use of software |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 | 38,000,000 |  |  |  |  |  |
Monetary damages for trade secret infringement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 453,000,000 | 2,900,000,000 |  |  |  |  |  |
Montary losses from copyright infringement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 1,200,000 |  |
Counterclaims under License Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 | 6,000,000
Restricted cash included in current assets |  |  |  |  | 6,136,000 | 12,086,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  | 4,820,000 | 2,540,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of performance bond |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit outstanding |  |  |  |  | $ 3,400,000 |  | € 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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