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Summary of Stock Options Outstanding (Detail) - $ / shares shares in Thousands	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015	May 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number	2,024	2,081	1,988	1,869
Options Outstanding, Average Contractual Life	3 years 6 months
Options Outstanding, Weighted-Average Exercise Price	$ 43.84	$ 36.71	$ 31.04	$ 25.69
Options Exercisable, Number	496	656	639	577
Options Exercisable, Weighted Average Exercise Price	$ 35.23	$ 29.69
$ 11.02 - $36.26
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	11.02
Range of Exercise price, maximum	$ 36.26
Options Outstanding, Number	491
Options Outstanding, Average Contractual Life	1 year 9 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 31.22
Options Exercisable, Number	268
Options Exercisable, Weighted Average Exercise Price	$ 29.16
$ 36.27 - $40.87
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	36.27
Range of Exercise price, maximum	$ 40.87
Options Outstanding, Number	382
Options Outstanding, Average Contractual Life	2 years 9 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 39.57
Options Exercisable, Number	113
Options Exercisable, Weighted Average Exercise Price	$ 39.54
$ 40.88 - $49.68
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	40.88
Range of Exercise price, maximum	$ 49.68
Options Outstanding, Number	536
Options Outstanding, Average Contractual Life	4 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 46.52
Options Exercisable, Number	115
Options Exercisable, Weighted Average Exercise Price	$ 45.12
$ 49.69 - $54.55
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	49.69
Range of Exercise price, maximum	$ 54.55
Options Outstanding, Number	576
Options Outstanding, Average Contractual Life	4 years 8 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 53.94
$ 54.56 - $65.71
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	54.56
Range of Exercise price, maximum	$ 65.71
Options Outstanding, Number	39
Options Outstanding, Average Contractual Life	7 years 8 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 58.74

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://www.xbrl.org/2003/role/presentationRef
-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=96867065&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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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