Stock-Based Compensation and Stock Options - Stock Options (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Options outstanding, beginning balance, Shares	778,982	975,917	937,158	1,029,103
Options granted, Shares	50,200	122,750	110,450	209,575
Options exercised, Shares	(25,917)	(62,997)	(212,588)	(187,815)
Options cancelled/forfeited, Shares	(6,407)	(2,234)	(38,162)	(17,427)
Options outstanding, ending balance, Shares	796,858	1,033,436	796,858	1,033,436
Options outstanding, beginning balance, Weighted Average Exercise Price	$ 72.17	$ 57.97	$ 64.28	$ 54.87
Options granted, Weighted Average Exercise Price	197.16	87.69	163.54	78.52
Options exercised, Weighted Average Exercise Price	62.78	44.83	53.27	40.13
Options cancelled/forfeited, Weighted Average Exercise Price	81.62	59.31	78.87	57.37
Options outstanding, ending balance, Weighted Average Exercise Price	$ 80.27	$ 62.30	$ 80.27	$ 62.30