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Stock Options Outstanding (Detail)	6 Months Ended
	Sep. 30, 2021 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding, Number of Shares Outstanding | shares	532,370
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	6 years 10 months 17 days
Options Outstanding, Weighted-Average Exercise Price	$ 84.89
Options Exercisable , Number of Shares Outstanding | shares	273,827
Options Exercisable, Weighted-Average Exercise Price	$ 90.07
$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)	8 months 15 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	191,982
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	7 years 5 months 1 day
Options Outstanding, Weighted-Average Exercise Price	$ 64.48
Options Exercisable , Number of Shares Outstanding | shares	61,760
Options Exercisable, Weighted-Average Exercise Price	$ 72.20
$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	87.34
Range of Exercise Prices, Upper Range	$ 93.03
Options Outstanding, Number of Shares Outstanding | shares	164,458
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	7 years 25 days
Options Outstanding, Weighted-Average Exercise Price	$ 91.36
Options Exercisable , Number of Shares Outstanding | shares	80,785
Options Exercisable, Weighted-Average Exercise Price	$ 91.14
$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	$ 139.25
Options Outstanding, Number of Shares Outstanding | shares	163,557
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	6 years 6 months 7 days
Options Outstanding, Weighted-Average Exercise Price	$ 106.16
Options Exercisable , Number of Shares Outstanding | shares	118,909
Options Exercisable, Weighted-Average Exercise Price	$ 104.40

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 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.

+ References

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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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-Publisher FASB
-Name Accounting Standards Codification
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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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-Publisher FASB
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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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