Income Taxes - Summary of Income Tax Provision (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Current — Federal	$ 14,745,000	$ 11,977,000	$ 16,608,000
Current — State	5,357,000	3,823,000	4,587,000
Subtotal	20,102,000	15,800,000	21,195,000
Deferred — Federal	(1,321,000)	1,784,000	(6,809,000)
Deferred — State	(592,000)	518,000	(1,567,000)
Subtotal	(1,913,000)	2,302,000	(8,376,000)
Total	$ 18,189,000	$ 18,102,000	$ 12,819,000