Restructuring Charge - Summary of Reconciliation of Changes in Restructuring Reserve (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring And Related Activities [Abstract]
Balance at beginning of period			$ 120	$ 74
Expense for restructuring	$ 316	$ 75	316	630
Amounts paid for restructuring			(76)	(475)
Balance at end of period	$ 360	$ 229	$ 360	$ 229