Leases - Schedule of Supplemental Cash Flow Information Related to Operating Leases (Detail) - USD ($)	6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 3,996,000	$ 3,838,000
Operating lease liabilities arising from obtaining ROU assets	51,648,000	52,155,000
Finance lease liabilities arising from obtaining ROU assets	358,000	358,000
Additions/(reductions) to ROU assets resulting from additions/(reductions) to operating lease liabilities	$ 1,672,000	$ (2,552,000)