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Commitments and Contingencies - Schedule of Rent Expense Under Operating Leases (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Commitments And Contingencies Disclosure [Abstract]      
Rent expense $ 1,628 $ 2,091 $ 2,152