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Commitments and Contingencies - Additional Information (Detail)
ft² in Thousands, $ in Thousands, ¥ in Millions
12 Months Ended
Feb. 27, 2012
USD ($)
Feb. 27, 2012
CNY (¥)
Oct. 08, 2011
USD ($)
Oct. 08, 2011
CNY (¥)
Sep. 13, 2011
USD ($)
Sep. 13, 2011
CNY (¥)
Mar. 31, 2011
USD ($)
Mar. 31, 2011
CNY (¥)
Mar. 31, 2017
USD ($)
ft²
Mar. 31, 2016
USD ($)
Loss Contingencies [Line Items]                    
Total space leased, square feet | ft²                 180  
Restricted cash included in current assets                 $ 795 $ 457
Restricted cash included in long-term assets                 $ 165 $ 934
Sinovel Wind Group Co. Ltd.                    
Loss Contingencies [Line Items]                    
Sought compensation amount $ 15,000 ¥ 105 $ 174,000 ¥ 1,200            
Sinovel Wind Group Co. Ltd.                    
Loss Contingencies [Line Items]                    
Sought compensation amount         $ 70,000 ¥ 485        
Value of the undelivered components             $ 667,000 ¥ 4,600