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Stock-Based Compensation and Stock Options - Stock Compensation Expense for Time Based Options and Performance Based Options (Detail) - USD ($)	3 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Effect on basic earnings per share	$ (0.53)	$ (0.42)
Effect on diluted earnings per share	$ (0.52)	$ (0.42)
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 tax provision	$ 1,417,000	$ 1,070,000
Amount of income tax benefit recognized	(323,000)	(246,000)
Amount charged against net income	$ 1,094,000	$ 824,000
Effect on basic earnings per share	$ (0.02)	$ (0.02)
Effect on diluted earnings per share	$ (0.02)	$ (0.02)
Time Based Options and Performance Based Options [Member] | Cost of Revenues [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 tax provision	$ 681,000	$ 715,000
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 tax provision	$ 736,000	$ 355,000

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