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Accounts Receivable (Narrative) (Details) (Accounts Receivable [Member])
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
INOX Wind Limited. [Member]
   
Risk percentage 41.00% 24.00%
CG Power Solutions UK Ltd. [Member]
   
Risk percentage 17.00% 14.00%
Hyundai Heavy Industries Co. Ltd [Member]
   
Risk percentage 11.00% 11.00%