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Stock Options and Stock-Based Compensation - Stock Compensation Expense for Time Based Options and Performance Based Options (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Basic	$ 1.85	$ 1.48	$ 1.28
Diluted	$ 1.83	$ 1.47	$ 1.26
Time Based Options and Performance Based Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total cost of stock-based compensation included in income before income taxes	$ 5,714,000	$ 4,982,000	$ 5,559,000
Amount of income tax benefit recognized	(1,256,000)	(987,000)	(1,210,000)
Amount charged to net income	$ 4,458,000	$ 3,995,000	$ 4,349,000
Basic	$ 0.09	$ 0.08	$ 0.08
Diluted	$ 0.09	$ 0.08	$ 0.08
Time Based Options and Performance Based Options [Member] | Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total cost of stock-based compensation included in income before income taxes	$ 2,794,000	$ 2,797,000	$ 2,566,000
Time Based Options and Performance Based Options [Member] | General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total cost of stock-based compensation included in income before income taxes	$ 2,920,000	$ 2,185,000	$ 2,993,000

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