Leases - Schedule of Supplemental Cash Flow Information Related to Operating Leases (Detail) - USD ($)	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 3,780,000	$ 3,660,000
Operating lease liabilities arising from obtaining ROU assets	59,448,000	99,064,000
Finance lease liabilities arising from obtaining ROU assets	358,000	0
Reductions to ROU assets resulting from reductions to operating lease liabilities	$ 2,929,000	$ 1,688,000