Stock-Based Compensation and Stock Options - Stock Options (Detail) - $ / shares	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding, beginning balance, Shares	937,158	1,029,103
Options granted, Shares	33,000	45,175
Options exercised, Shares	(118,756)	(44,363)
Options cancelled/forfeited, Shares	(4,777)	(12,421)
Options outstanding, ending balance, Shares	846,625	1,017,494
Options outstanding, beginning balance, Weighted Average Exercise Price	$ 64.28	$ 54.87
Options granted, Weighted Average Exercise Price	119.48	52.69
Options exercised, Weighted Average Exercise Price	49.17	36.15
Options cancelled/forfeited, Weighted Average Exercise Price	72.97	58.98
Options outstanding, ending balance, Weighted Average Exercise Price	$ 68.50	$ 55.54