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Commitments and Contingencies - Schedule of Rent Expense Under Operating Leases (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Commitments And Contingencies Disclosure [Abstract]      
Rent expense $ 2,091us-gaap_LeaseAndRentalExpense $ 2,152us-gaap_LeaseAndRentalExpense $ 2,437us-gaap_LeaseAndRentalExpense