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Summary of Stock Options Outstanding (Detail) - $ / shares	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020	May 31, 2019
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number	3,244,000	2,957,000	4,324,000	4,770,000
Options Outstanding, Average Contractual Life	2 years 6 months
Options Outstanding, Weighted-Average Exercise Price	$ 32.13	$ 30.38	$ 27.98	$ 24.69
Options Exercisable, Number	1,191,000	643,000	972,000	1,234,000
Options Exercisable, Weighted Average Exercise Price	$ 30.24	$ 28.1	$ 24.47
$10.75 - $20.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	10.75
Range of Exercise price, maximum	$ 20
Options Outstanding, Number	49,000
Options Outstanding, Average Contractual Life	2 years 3 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 15.43
Options Exercisable, Number	49,000
Options Exercisable, Weighted Average Exercise Price	$ 15.43
$20.01 - $28.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	20.01
Range of Exercise price, maximum	$ 28.99
Options Outstanding, Number	344,000
Options Outstanding, Average Contractual Life	3 years 9 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 26.8
Options Exercisable, Number	83,000
Options Exercisable, Weighted Average Exercise Price	$ 23.08
$29.00 - $30.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	29
Range of Exercise price, maximum	$ 30.99
Options Outstanding, Number	493,000
Options Outstanding, Average Contractual Life	10 months 24 days
Options Outstanding, Weighted-Average Exercise Price	$ 30.16
Options Exercisable, Number	332,000
Options Exercisable, Weighted Average Exercise Price	$ 30.13
$31.00 - $31.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	31
Range of Exercise price, maximum	$ 31.99
Options Outstanding, Number	1,509,000
Options Outstanding, Average Contractual Life	2 years
Options Outstanding, Weighted-Average Exercise Price	$ 31.7
Options Exercisable, Number	581,000
Options Exercisable, Weighted Average Exercise Price	$ 31.64
$32.00 - $42.45
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	32
Range of Exercise price, maximum	$ 42.45
Options Outstanding, Number	849,000
Options Outstanding, Average Contractual Life	3 years 8 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 37.16
Options Exercisable, Number	146,000
Options Exercisable, Weighted Average Exercise Price	$ 33.88

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ 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=120381028&loc=d3e5070-113901

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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-Publisher FASB
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- Definition

Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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.

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

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