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Summary of Stock Options Outstanding (Detail) - $ / shares	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019	May 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number	2,957,000	4,324,000	4,770,000	4,998,000
Options Outstanding, Average Contractual Life	2 years 9 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 30.38	$ 27.98	$ 24.69	$ 21.32
Options Exercisable, Number	643,000	972,000	1,234,000	1,016,000
Options Exercisable, Weighted Average Exercise Price	$ 28.10	$ 24.47	$ 20.34
$16.82 - $40.91
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	$ 20.00
Options Outstanding, Number	54,000
Options Outstanding, Average Contractual Life	3 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 15.65
Options Exercisable, Number	51,000
Options Exercisable, Weighted Average Exercise Price	$ 15.45
$40.92 - $61.56
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	$ 30.00
Options Outstanding, Number	376,000
Options Outstanding, Average Contractual Life	1 year 9 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 22.55
Options Exercisable, Number	150,000
Options Exercisable, Weighted Average Exercise Price	$ 23.07
$61.57 - $62.88
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	30.01
Range of Exercise price, maximum	$ 31.50
Options Outstanding, Number	1,150,000
Options Outstanding, Average Contractual Life	2 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 30.87
Options Exercisable, Number	299,000
Options Exercisable, Weighted Average Exercise Price	$ 30.76
$62.89 - $64.05
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	31.51
Range of Exercise price, maximum	$ 32.00
Options Outstanding, Number	898,000
Options Outstanding, Average Contractual Life	3 years 4 months 24 days
Options Outstanding, Weighted-Average Exercise Price	$ 31.95
Options Exercisable, Number	101,000
Options Exercisable, Weighted Average Exercise Price	$ 31.95
$64.06 - $68.96
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	32.01
Range of Exercise price, maximum	$ 35.28
Options Outstanding, Number	479,000
Options Outstanding, Average Contractual Life	4 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 34.07
Options Exercisable, Number	42,000
Options Exercisable, Weighted Average Exercise Price	$ 33.53

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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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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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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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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