Segment Information - Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 575,559	$ 588,224	$ 1,660,325	$ 1,717,517
U.S. Customers [Member]
Segment Reporting Information [Line Items]
Total revenues	512,439	523,455	1,523,969	1,521,022
Non U.S. Customers [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 63,120	$ 64,769	$ 136,356	$ 196,495