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Stock Options Outstanding (Detail)	12 Months Ended
	Mar. 31, 2024 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding, Number of Shares Outstanding | shares	252,364
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	5 years 10 months 24 days
Options Outstanding, Weighted-Average Exercise Price	$ 91.04
Options Exercisable , Number of Shares Outstanding | shares	215,913
Options Exercisable, Weighted-Average Exercise Price	$ 84.24
$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	107,490
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	5 years 7 months 20 days
Options Outstanding, Weighted-Average Exercise Price	$ 62.5
Options Exercisable , Number of Shares Outstanding | shares	107,490
Options Exercisable, Weighted-Average Exercise Price	$ 62.5
$87.37 - $93.03 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range	91.21
Range of Exercise Prices, Upper Range	$ 106
Options Outstanding, Number of Shares Outstanding | shares	75,608
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	4 years 3 months 7 days
Options Outstanding, Weighted-Average Exercise Price	$ 94.15
Options Exercisable , Number of Shares Outstanding | shares	73,750
Options Exercisable, Weighted-Average Exercise Price	$ 94.07
$99.37 - $143.09 [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	$ 190.97
Options Outstanding, Number of Shares Outstanding | shares	69,266
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	8 years 29 days
Options Outstanding, Weighted-Average Exercise Price	$ 131.95
Options Exercisable , Number of Shares Outstanding | shares	34,673
Options Exercisable, Weighted-Average Exercise Price	$ 130.74

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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