Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Property Plant And Equipment [Abstract]
Land	$ 7,680	$ 4,046
Building and building improvements	63,700	10,900
Capital lease asset		16,784
Leasehold improvements	2,905	34,854
Machinery and equipment	42,787	27,989
Furniture and fixtures	8,104	3,899
Construction in progress	19,850	9,257
Total cost	145,026	107,729
Less accumulated depreciation	(27,859)	(19,952)
Property and equipment, net	$ 117,167	$ 87,777