Stock-Based Compensation and Stock Options - Stock Compensation Expense for Time Based Options and Performance Based Options (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Effect on basic earnings per share	$ (0.46)	$ (0.33)	$ (1.34)	$ (1.11)
Effect on diluted earnings per share	$ (0.46)	$ (0.33)	$ (1.32)	$ (1.09)
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	$ 1,823,000	$ 1,076,000	$ 4,376,000	$ 3,690,000
Amount of income tax benefit recognized	(416,000)	(254,000)	(938,000)	(799,000)
Amount charged against net income	$ 1,407,000	$ 822,000	$ 3,438,000	$ 2,891,000
Effect on basic earnings per share	$ (0.03)	$ (0.02)	$ (0.07)	$ (0.06)
Effect on diluted earnings per share	$ (0.03)	$ (0.02)	$ (0.07)	$ (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	$ 685,000	$ 731,000	$ 2,123,000	$ 2,078,000
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	$ 1,138,000	$ 345,000	$ 2,253,000	$ 1,612,000