Income Taxes - Summary of Income Tax Provision (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Current — Federal	$ 11,977,000	$ 16,608,000	$ 9,212,000
Current — State	3,823,000	4,587,000	2,652,000
Subtotal	15,800,000	21,195,000	11,864,000
Deferred — Federal	1,784,000	(6,809,000)	1,418,000
Deferred — State	518,000	(1,567,000)	52,000
Subtotal	2,302,000	(8,376,000)	1,470,000
Total	$ 18,102,000	$ 12,819,000	$ 13,334,000