Calculation of Basic and Diluted Common Shares Outstanding (Detail) - shares	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Weighted-Average Shares of Common Stock Outstanding	35,056,973	37,140,197	35,165,268	37,559,087
Assumed Exercise of Outstanding Dilutive Options	312,065	420,199	316,163	424,489
Less Shares Repurchased from Proceeds of Assumed Exercised Options	(169,038)	(310,956)	(171,659)	(311,373)
Restricted Stock Units	136,966	117,439	124,065	120,410
Weighted-Average Common Stock and Dilutive Securities Outstanding	35,336,966	37,366,879	35,433,837	37,792,613
Shares Excluded Due to Anti-Dilution Effects	4,884	46,750	31,586	39,703