Business Segments Information - Reconciliation of Gross Profit to Segment Adjusted Gross Profit (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting [Abstract]
Gross profit	$ 188,503	$ (62,158)
Depreciation and amortization	16,423	13,684
ESOP and stock-based compensation expense	4,939	3,771
ESOP special dividend compensation		168,610
COVID-19 related costs	180
Total Segment Adjusted Gross Profit	$ 210,045	$ 123,907