Stock Options Outstanding (Detail)	9 Months Ended
	Dec. 31, 2023 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding, Number of Shares Outstanding | shares	310,408
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	5 years 11 months 8 days
Options Outstanding, Weighted-Average Exercise Price	$ 91.86
Options Exercisable , Number of Shares Outstanding | shares	215,822
Options Exercisable, Weighted-Average Exercise Price	$ 88.86
$59.32 - $81.28 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	59.32
Range of Exercise Prices, Upper Range	$ 81.28
Options Outstanding, Number of Shares Outstanding | shares	113,490
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	5 years 10 months 28 days
Options Outstanding, Weighted-Average Exercise Price	$ 62.49
Options Exercisable , Number of Shares Outstanding | shares	71,086
Options Exercisable, Weighted-Average Exercise Price	$ 63.67
$87.37 - $106.24 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	87.37
Range of Exercise Prices, Upper Range	$ 106.24
Options Outstanding, Number of Shares Outstanding | shares	125,721
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	4 years 7 months 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 95.77
Options Exercisable , Number of Shares Outstanding | shares	122,005
Options Exercisable, Weighted-Average Exercise Price	$ 95.72
$118.27 - $166.75 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	118.27
Range of Exercise Prices, Upper Range	$ 166.75
Options Outstanding, Number of Shares Outstanding | shares	71,197
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	8 years 4 months 2 days
Options Outstanding, Weighted-Average Exercise Price	$ 131.77
Options Exercisable , Number of Shares Outstanding | shares	22,731
Options Exercisable, Weighted-Average Exercise Price	$ 130.79