Stock-Based Compensation and Stock Options - Stock Compensation Expense for Time Based Options and Performance Based Options (Detail) - USD ($)	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Effect on basic earnings per share	$ (1.26)	$ (1.16)
Effect on diluted earnings per share	$ (1.25)	$ (1.14)
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	$ 1,070,000	$ 1,312,000
Amount of income tax benefit recognized	(246,000)	(290,000)
Amount charged against net income	$ 824,000	$ 1,022,000
Effect on basic earnings per share	$ (0.05)	$ (0.06)
Effect on diluted earnings per share	$ (0.05)	$ (0.06)
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	$ 715,000	$ 668,000
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	$ 355,000	$ 644,000