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Summary of Stock Options Outstanding (Detail) - $ / shares shares in Thousands	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017	May 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number	2,385	2,499	2,699	2,775
Options Outstanding, Average Contractual Life	3 years 2 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 49.37	$ 42.63	$ 32.88	$ 27.53
Options Exercisable, Number	617	508	661	875
Options Exercisable, Weighted Average Exercise Price	$ 40.68	$ 31.23
$10.17 - $37.26
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	10.17
Range of Exercise price, maximum	$ 37.26
Options Outstanding, Number	575
Options Outstanding, Average Contractual Life	1 year 8 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 32.07
Options Exercisable, Number	290
Options Exercisable, Weighted Average Exercise Price	$ 30.62
$37.27 - $40.91
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	37.27
Range of Exercise price, maximum	$ 40.91
Options Outstanding, Number	492
Options Outstanding, Average Contractual Life	2 years 9 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 40.45
Options Exercisable, Number	147
Options Exercisable, Weighted Average Exercise Price	$ 40.44
$40.92 - $59.78
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	40.92
Range of Exercise price, maximum	$ 59.78
Options Outstanding, Number	172
Options Outstanding, Average Contractual Life	4 years
Options Outstanding, Weighted-Average Exercise Price	$ 51.03
Options Exercisable, Number	54
Options Exercisable, Weighted Average Exercise Price	$ 49.19
$59.79 - $61.56
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	59.79
Range of Exercise price, maximum	$ 61.56
Options Outstanding, Number	614
Options Outstanding, Average Contractual Life	3 years 6 months
Options Outstanding, Weighted-Average Exercise Price	$ 60.43
Options Exercisable, Number	124
Options Exercisable, Weighted Average Exercise Price	$ 60.43
$61.57 - $68.96
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	61.57
Range of Exercise price, maximum	$ 68.96
Options Outstanding, Number	532
Options Outstanding, Average Contractual Life	4 years 6 months
Options Outstanding, Weighted-Average Exercise Price	$ 63.03
Options Exercisable, Number	2
Options Exercisable, Weighted Average Exercise Price	$ 68.36

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=109197908&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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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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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