Stock Options Outstanding (Detail)	9 Months Ended
	Dec. 31, 2021 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding, Number of Shares Outstanding | shares	468,059
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	6 years 9 months 14 days
Options Outstanding, Weighted-Average Exercise Price	$ 83.11
Options Exercisable , Number of Shares Outstanding | shares	211,516
Options Exercisable, Weighted-Average Exercise Price	$ 87.85
$33.69 - $37.34 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	33.69
Range of Exercise Prices, Upper Range	$ 37.34
Options Outstanding, Number of Shares Outstanding | shares	12,373
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	5 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 34.52
Options Exercisable , Number of Shares Outstanding | shares	12,373
Options Exercisable, Weighted-Average Exercise Price	$ 34.52
$59.32 - $81.56 [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	$ 81.56
Options Outstanding, Number of Shares Outstanding | shares	180,192
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	7 years 4 months 20 days
Options Outstanding, Weighted-Average Exercise Price	$ 63.48
Options Exercisable , Number of Shares Outstanding | shares	49,970
Options Exercisable, Weighted-Average Exercise Price	$ 70.43
$87.34 - $93.03 [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	$ 93.03
Options Outstanding, Number of Shares Outstanding | shares	159,768
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	6 years 10 months 2 days
Options Outstanding, Weighted-Average Exercise Price	$ 91.35
Options Exercisable , Number of Shares Outstanding | shares	76,095
Options Exercisable, Weighted-Average Exercise Price	$ 91.11
$99.37 - $139.25 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	99.37
Range of Exercise Prices, Upper Range	$ 143.09
Options Outstanding, Number of Shares Outstanding | shares	115,726
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	6 years 5 months 19 days
Options Outstanding, Weighted-Average Exercise Price	$ 107.49
Options Exercisable , Number of Shares Outstanding | shares	73,078
Options Exercisable, Weighted-Average Exercise Price	$ 105.41