Stock-Based Compensation and Stock Options - Stock Options (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Options outstanding, beginning balance, Shares	469,167	611,901	489,727	651,857
Options granted, Shares	6,250	16,500	21,000	16,500
Options exercised, Shares	(46,405)	(50,776)	(79,350)	(90,247)
Options cancelled/forfeited, Shares	(403)	(2,362)	(2,768)	(2,847)
Options outstanding, ending balance, Shares	428,609	575,263	428,609	575,263
Options outstanding, beginning balance, Weighted Average Exercise Price	$ 136.02	$ 110.1	$ 129.39	$ 108.1
Options granted, Weighted Average Exercise Price	306.82	222.26	281.13	222.26
Options exercised, Weighted Average Exercise Price	93.04	74.53	94.01	75.08
Options cancelled/forfeited, Weighted Average Exercise Price	167.86	145.71	165.75	147.59
Options outstanding, ending balance, Weighted Average Exercise Price	$ 143.14	$ 116.31	$ 143.14	$ 116.31