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Summary of Stock Options Outstanding (Detail) - $ / shares shares in Thousands	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014	May 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number	2,081	1,988	1,869	2,092
Options Outstanding, Average Remaining Contractual Life	3 years 4 months 24 days
Options Outstanding, Weighted-Average Exercise Price	$ 36.71	$ 31.04	$ 25.69	$ 19.21
Options Exercisable, Number	656	639	577	749
Options Exercisable, Weighted Average Exercise Price	$ 29.69	$ 24.50
$ 6.01 - $28.26
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	6.01
Range of Exercise price, maximum	$ 28.26
Options Outstanding, Number	277
Options Outstanding, Average Remaining Contractual Life	1 year 9 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 20.67
Options Exercisable, Number	209
Options Exercisable, Weighted Average Exercise Price	$ 19.88
$ 28.27 - $ 32.37
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	28.27
Range of Exercise price, maximum	$ 32.37
Options Outstanding, Number	321
Options Outstanding, Average Remaining Contractual Life	2 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 28.67
Options Exercisable, Number	173
Options Exercisable, Weighted Average Exercise Price	$ 28.67
$ 32.38 - $ 38.03
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	32.38
Range of Exercise price, maximum	$ 38.03
Options Outstanding, Number	408
Options Outstanding, Average Remaining Contractual Life	2 years 7 months 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 36.07
Options Exercisable, Number	156
Options Exercisable, Weighted Average Exercise Price	$ 36.07
$ 38.04 -$ 43.75
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	38.04
Range of Exercise price, maximum	$ 43.75
Options Outstanding, Number	532
Options Outstanding, Average Remaining Contractual Life	4 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price	$ 39.88
Options Exercisable, Number	118
Options Exercisable, Weighted Average Exercise Price	$ 40.10
$ 43.76 - $ 47.12
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise price, minimum	43.76
Range of Exercise price, maximum	$ 47.12
Options Outstanding, Number	543
Options Outstanding, Average Remaining Contractual Life	4 years 10 months 24 days
Options Outstanding, Weighted-Average Exercise Price	$ 46.99
Options Exercisable, Number	0

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=6415400&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=6415400&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=6415400&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6415400&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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6415400&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)
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