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Stock Option Activity (Detail) - $ / shares | 12 Months Ended
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May 31, 2021 | May 31, 2020 | May 31, 2019
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Options Outstanding, Beginning Balance | 4,324,000 | 4,770,000 | 4,998,000
Options, Granted | 403,000 | 1,124,000 | 1,054,000
Options, Exercised | (1,389,000) | (1,438,000) | (1,026,000)
Options, Forfeited | (381,000) | (132,000) | (256,000)
Options Outstanding, Ending Balance | 2,957,000 | 4,324,000 | 4,770,000
Weighted-Average Exercise Price, Beginning Balance | $ 27.98 | $ 24.69 | $ 21.32
Weighted-Average Exercise Price, Granted | 34.23 | 31.96 | 31.46
Weighted-Average Exercise Price, Exercised | 24.38 | 20.12 | 15.64
Weighted-Average Exercise Price, Forfeited | 28.99 | 28.72 | 23.54
Weighted-Average Exercise Price, Ending Balance | 30.38 | 27.98 | 24.69
Weighted-Average Grant Date Fair Value, Beginning Balance | 6.98 | 6.35 | 5.72
Weighted-Average Grant Date Fair Value, Granted | 7.71 | 7.78 | 7.46
Weighted-Average Grant Date Fair Value, Exercised | 6.31 | 5.53 | 4.46
Weighted-Average Grant Date Fair Value, Forfeited | 7.20 | 7.10 | 6.21
Weighted-Average Grant Date Fair Value, Ending Balance | $ 7.36 | $ 6.98 | $ 6.35

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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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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