Calculation of Basic and Diluted Common Shares Outstanding (Detail) - shares	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Weighted-Average Shares of Common Stock Outstanding	37,140,197	41,222,161	37,559,087	41,623,187
Assumed Exercise of Outstanding Dilutive Options	420,199	560,876	424,489	606,876
Less Shares Repurchased from Proceeds of Assumed Exercised Options	(310,956)	(365,887)	(311,373)	(395,516)
Restricted Stock	117,439	177,583	120,410	179,300
Weighted-Average Common Stock and Dilutive Securities Outstanding	37,366,879	41,594,733	37,792,613	42,013,847
Shares Excluded Due to Anti-Dilution Effects	46,750	3,578	39,703	2,684