Income Taxes - Summary of Benefit from (Provision for) Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Current tax benefit (provision)
Federal	$ (284)	$ (2,041)	$ (132)
State	(401)	(1,167)	(543)
Foreign	(953)	(600)	(148)
Total current tax provision	(1,638)	(3,808)	(823)
Deferred tax benefit (provision)
Federal	24,833	(4,410)	(2,266)
State	10,450	4,509	7,090
Foreign	1,572	92	172
Total deferred tax benefit (provision)	36,855	191	4,996
Total benefit from (provision for) income taxes	$ 35,217	$ (3,617)	$ 4,173