Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017
Property Plant And Equipment [Abstract]
Land	$ 4,326	$ 4,046
Building and building improvements	12,146	10,900
Capital lease asset	16,784	16,784
Leasehold improvements	34,962	34,854
Machinery and equipment	31,340	27,989
Furniture and fixtures	6,211	3,899
Construction in progress	10,075	9,257
Total cost	115,844	107,729
Less accumulated depreciation	(23,040)	(19,952)
Property and equipment, net	$ 92,804	$ 87,777