Stock-Based Compensation and Stock Options - Stock Options (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-Based Payment Arrangement [Abstract]
Options outstanding, beginning balance, Shares	722,343	846,625	723,876	937,158
Options granted, Shares	35,600	27,250	80,200	60,250
Options exercised, Shares	(39,947)	(67,915)	(83,686)	(186,671)
Options cancelled/forfeited, Shares	(11,268)	(26,978)	(13,662)	(31,755)
Options outstanding, ending balance, Shares	706,728	778,982	706,728	778,982
Options outstanding, beginning balance, Weighted Average Exercise Price	$ 90.94	$ 68.50	$ 84.55	$ 64.28
Options granted, Weighted Average Exercise Price	163.61	154.97	155.42	135.53
Options exercised, Weighted Average Exercise Price	52.97	56.83	47.59	51.95
Options cancelled/forfeited, Weighted Average Exercise Price	130.12	79.26	128.64	78.31
Options outstanding, ending balance, Weighted Average Exercise Price	$ 96.14	$ 72.17	$ 96.14	$ 72.17