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Inventory - Schedule of Inventory (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Mar. 31, 2013
Inventory [Line Items]    
Raw materials $ 7,183 $ 5,966
Work-in-process 3,530 3,427
Finished goods 10,689 21,655
Deferred program costs 3,072 2,425
Net inventory $ 24,474 $ 33,473