Consolidated Balance Sheet Detail - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017
Property Plant And Equipment [Line Items]
Total property and equipment	$ 88,144	$ 78,426
Less: accumulated depreciation	(18,082)	(14,896)
Total property and equipment, net	70,062	63,530
Land [Member]
Property Plant And Equipment [Line Items]
Total property and equipment	1,339	1,286
Plant and Equipment [Member]
Property Plant And Equipment [Line Items]
Total property and equipment	47,515	44,797
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Total property and equipment	$ 39,290	$ 32,343