Income Taxes - Summary of Benefit from (Provision for) Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Current tax provision
Federal	$ (821)	$ (284)	$ (2,041)
State	(690)	(401)	(1,167)
Foreign	(1,619)	(953)	(600)
Total current tax provision	(3,130)	(1,638)	(3,808)
Deferred tax benefit (provision)
Federal	34,099	24,833	(4,410)
State	8,738	10,450	4,509
Foreign	1,307	1,572	92
Total deferred tax benefit (provision)	44,144	36,855	191
Total benefit from (provision for) income taxes	$ 41,014	$ 35,217	$ (3,617)