Stock Option Activity (Detail)	3 Months Ended
	Jun. 30, 2022 $ / shares shares
Share-based Payment Arrangement [Abstract]
Number of Shares, Outstanding Options at March 31, 2022 | shares	456,849
Number of Shares, Granted | shares	51,522
Number of Shares, Exercised | shares	(17,159)
Number of Shares, Cancelled | shares	0
Number of Shares, Outstanding Options at June 30, 2022 | shares	491,212
Number of Shares, Options Exercisable at June 30, 2022 | shares	298,520
Weighted-Average Exercise Price, Outstanding Options at March 31, 2022 | $ / shares	$ 83.81
Weighted-Average Exercise Price, Granted | $ / shares	125.88
Weighted-Average Exercise Price, Exercised | $ / shares	125.12
Weighted-Average Exercise Price, Cancelled | $ / shares	0
Weighted-Average Exercise Price, Outstanding Options at June 30, 2022 | $ / shares	88.85
Weighted Average Fair Value of Options Granted During the Year | $ / shares	$ 125.88