Segment Information - Revenues by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 701,354	$ 554,278	$ 1,366,214	$ 1,084,766
U.S. Customers [Member]
Segment Reporting Information [Line Items]
Total revenues	598,291	513,015	1,165,777	1,011,530
Non U.S. Customers [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 103,063	$ 41,263	$ 200,437	$ 73,236