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Stock-Based Compensation - Summary of Information Regarding Stock Options Outstanding and Exercisable (Detail)	12 Months Ended
	Mar. 31, 2021 $ / shares shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of Options | shares	799,501
Weighted- Average Remaining Contractual Life (Years)	7 years 9 months 18 days
Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 72.31
$57.60-$60.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of Options | shares	231,025
Weighted- Average Remaining Contractual Life (Years)	7 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 57.73
$60.01-$70.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of Options | shares	56,530
Weighted- Average Remaining Contractual Life (Years)	3 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 68.78
$70.01-$83.14
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of Options | shares	511,946
Weighted- Average Remaining Contractual Life (Years)	8 years 2 months 12 days
Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 79.28

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

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

+ 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
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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