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Stock Option Activity (Detail) - $ / shares shares in Thousands | 12 Months Ended
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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, Beginning Balance | 2,699 | 2,775 | 2,651
Options, Granted | 829 | 828 | 732
Options, Exercised | (821) | (827) | (569)
Options, Forfeited | (208) | (77) | (39)
Options Outstanding, Ending Balance | 2,499 | 2,699 | 2,775
Weighted-Average Exercise Price, Beginning Balance | $ 32.88 | $ 27.53 | $ 23.29
Weighted-Average Exercise Price, Granted | 59.37 | 40.68 | 35.23
Weighted-Average Exercise Price, Exercised | 28.18 | 22.82 | 17.60
Weighted-Average Exercise Price, Forfeited | 39.57 | 32.04 | 28.93
Weighted-Average Exercise Price, Ending Balance | 42.63 | 32.88 | 27.53
Weighted-Average Grant Date Fair Value, Beginning Balance | 9.51 | 7.97 | 6.90
Weighted-Average Grant Date Fair Value, Granted | 14.47 | 11.89 | 9.83
Weighted-Average Grant Date Fair Value, Exercised | 8.20 | 6.77 | 5.36
Weighted-Average Grant Date Fair Value, Forfeited | 11.12 | 9.17 | 8.36
Weighted-Average Grant Date Fair Value, Ending Balance | $ 11.44 | $ 9.51 | $ 7.97

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Exercised In Period Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Options, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock 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)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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