Income Taxes - Summary of Income Tax Provision (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Current — Federal	$ 17,463,000	$ 14,745,000	$ 11,977,000
Current — State	4,707,000	5,357,000	3,823,000
Subtotal	22,170,000	20,102,000	15,800,000
Deferred — Federal	(2,828,000)	(1,321,000)	1,784,000
Deferred — State	(493,000)	(592,000)	518,000
Subtotal	(3,321,000)	(1,913,000)	2,302,000
Total	$ 18,849,000	$ 18,189,000	$ 18,102,000