Segment Information - Revenue Information by Geographic Area (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 2,256,107	$ 2,309,238	$ 2,068,258
U.S. Customers [Member]
Segment Reporting Information [Line Items]
Total revenues	2,063,832	2,057,458	1,836,304
Non U.S. Customers [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 192,275	$ 251,780	$ 231,954