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, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Effect on basic earnings per share	$ (1)	$ (0.98)	$ (3.32)	$ (2.77)
Effect on diluted earnings per share	$ (0.99)	$ (0.96)	$ (3.27)	$ (2.73)
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	$ 1,076,000	$ 1,698,000	$ 3,690,000	$ 4,027,000
Amount of income tax benefit recognized	(254,000)	(410,000)	(799,000)	(895,000)
Amount charged against net income	$ 822,000	$ 1,288,000	$ 2,891,000	$ 3,132,000
Effect on basic earnings per share	$ (0.05)	$ (0.07)	$ (0.17)	$ (0.18)
Effect on diluted earnings per share	$ (0.05)	$ (0.07)	$ (0.17)	$ (0.18)
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	$ 731,000	$ 670,000	$ 2,078,000	$ 1,879,000
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	$ 345,000	$ 1,028,000	$ 1,612,000	$ 2,148,000