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Summary of Stock Options Outstanding (Detail) - $ / shares shares in Thousands	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016	May 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number	2,499	2,699	2,775	2,651
Options Outstanding, Average Contractual Life	3 years 6 months
Options Outstanding, Weighted-Average Exercise Price	$ 42.63	$ 32.88	$ 27.53	$ 23.29
Options Exercisable, Number	508	661	875	852
Options Exercisable, Weighted Average Exercise Price	$ 31.23	$ 26.49
$8.27 - $30.03
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	8.27
Range of Exercise price, maximum	$ 30.03
Options Outstanding, Number	515
Options Outstanding, Average Contractual Life	1 year 6 months
Options Outstanding, Weighted-Average Exercise Price	$ 27.08
Options Exercisable, Number	226
Options Exercisable, Weighted Average Exercise Price	$ 24.78
$30.04 - $37.26
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	30.04
Range of Exercise price, maximum	$ 37.26
Options Outstanding, Number	522
Options Outstanding, Average Contractual Life	3 years 2 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 34.84
Options Exercisable, Number	179
Options Exercisable, Weighted Average Exercise Price	$ 34.00
$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	619
Options Outstanding, Average Contractual Life	3 years 9 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 40.45
Options Exercisable, Number	90
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	173
Options Outstanding, Average Contractual Life	6 years
Options Outstanding, Weighted-Average Exercise Price	$ 50.85
Options Exercisable, Number	13
Options Exercisable, Weighted Average Exercise Price	$ 42.19
$59.79 - $68.96
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	$ 68.96
Options Outstanding, Number	670
Options Outstanding, Average Contractual Life	4 years 6 months
Options Outstanding, Weighted-Average Exercise Price	$ 60.55

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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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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- Definition

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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