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Stock Option Activity (Detail) - $ / shares | 12 Months Ended
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May 31, 2020 | May 31, 2019 | May 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Options Outstanding, Beginning Balance | 2,385,000 | 2,499,000 | 2,699,000
Options, Granted | 562,000 | 527,000 | 829,000
Options, Exercised | (719,000) | (513,000) | (821,000)
Options, Forfeited | (66,000) | (128,000) | (208,000)
Options Outstanding, Ending Balance | 2,162,000 | 2,385,000 | 2,499,000
Weighted-Average Exercise Price, Beginning Balance | $ 49.37 | $ 42.63 | $ 32.88
Weighted-Average Exercise Price, Granted | 63.91 | 62.92 | 59.37
Weighted-Average Exercise Price, Exercised | 40.24 | 31.28 | 28.18
Weighted-Average Exercise Price, Forfeited | 57.44 | 47.08 | 39.57
Weighted-Average Exercise Price, Ending Balance | 55.96 | 49.37 | 42.63
Weighted-Average Grant Date Fair Value, Beginning Balance | 12.70 | 11.44 | 9.51
Weighted-Average Grant Date Fair Value, Granted | 15.56 | 14.91 | 14.47
Weighted-Average Grant Date Fair Value, Exercised | 11.05 | 8.92 | 8.20
Weighted-Average Grant Date Fair Value, Forfeited | 14.20 | 12.42 | 11.12
Weighted-Average Grant Date Fair Value, Ending Balance | $ 13.95 | $ 12.70 | $ 11.44

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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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