Stock-Based Compensation and Stock Options - Outstanding Options (Detail) - USD ($)	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Share-Based Payment Arrangement [Abstract]
Options outstanding, beginning balance, Shares	723,876	937,158
Granted, Number of Options	44,600	33,000
Exercised, Number of Options	(43,739)	(118,756)
Cancelled - forfeited, Number of Options	(2,394)
Options outstanding, ending balance, Shares	722,343	846,625
Ending vested and expected to vest, Number of Options	657,869
Ending exercisable, Number of Options	338,791
Options outstanding, beginning balance, Weighted Average Exercise Price	$ 84.55	$ 64.28
Granted, Weighted Average Exercise Price per Share	148.89	119.48
Exercised, Weighted Average Exercise Price per Share	42.69	49.17
Cancelled - forfeited, Weighted Average Exercise Price per Share	121.79
Options outstanding, ending balance, Weighted Average Exercise Price	90.94	$ 68.50
Ending vested and expected to vest, Weighted Average Exercise Price per Share	89.54
Ending exercisable, Weighted Average Exercise Price per Share	$ 63.61
Option outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 3 months 18 days
Ending vested and expected to vest, Weighted Average Remaining Contractual Life (Years)	3 years 3 months 25 days
Ending exercisable, Weighted Average Remaining Contractual Life (Years)	2 years 6 months 18 days
Ending Outstanding Aggregate Intrinsic Value	$ 43,555,855
Ending vested and expected to vest, Aggregate Intrinsic Value	40,212,900
Ending exercisable, Aggregate Intrinsic Value	$ 28,342,859