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Income Taxes - Summary of Reconciliation Income Tax Provision from the Statutory Federal Income Tax Rate (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Income taxes at federal statutory rate	$ 25,373,000	$ 19,971,000	$ 17,757,000
State income taxes, net of federal benefit	4,937,000	3,369,000	3,890,000
Uncertain tax positions	9,000	(22,000)	(77,000)
Stock-based compensation and 162(m) limitation	(3,687,000)	(3,961,000)	(3,098,000)
Permanent items and tax credits	(568,000)	(480,000)	(384,000)
Adjustments to returns as filed	(420,000)	67,000	163,000
Valuation allowance	15,000	(95,000)	(62,000)
Total	$ 25,659,000	$ 18,849,000	$ 18,189,000

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