Basis of Preparation and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Apr. 01, 2017
Summary Of Significant Accounting Policy [Line Items]
Cumulative effect to increase retained earnings and deferred tax assets			$ 77,081
Excess tax benefits related to restricted stock unit vestings or stock option exercises, decrease in financing activities		$ 1,041
Excess tax benefits related to restricted stock unit vestings or stock option exercises, increase in operating activities		$ 1,041
ASU 2016-09
Summary Of Significant Accounting Policy [Line Items]
Excess tax benefit	$ 16,800
Excess tax benefits related to restricted stock unit vestings or stock option exercises, decrease in financing activities	16,800
Excess tax benefits related to restricted stock unit vestings or stock option exercises, increase in operating activities	$ 16,800
Increase additional paid in capital			1,800
Increase deferred tax assets			700
Decrease retained earnings			(1,100)
Adjustment to Increase Retained Earnings and Deferred Tax Assets | ASU 2016-09
Summary Of Significant Accounting Policy [Line Items]
Cumulative effect to increase retained earnings and deferred tax assets			$ 76,400