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Stock Option Activity (Detail) - $ / shares | 12 Months Ended
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May 31, 2022 | May 31, 2021 | May 31, 2020
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Options Outstanding, Beginning Balance | 2,957,000 | 4,324,000 | 4,770,000
Options, Granted | 615,000 | 403,000 | 1,124,000
Options, Exercised | (281,000) | (1,389,000) | (1,438,000)
Options, Forfeited | (47,000) | (381,000) | (132,000)
Options Outstanding, Ending Balance | 3,244,000 | 2,957,000 | 4,324,000
Weighted-Average Exercise Price, Beginning Balance | $ 30.38 | $ 27.98 | $ 24.69
Weighted-Average Exercise Price, Granted | 36.42 | 34.23 | 31.96
Weighted-Average Exercise Price, Exercised | 22.79 | 24.38 | 20.12
Weighted-Average Exercise Price, Forfeited | 33.93 | 28.99 | 28.72
Weighted-Average Exercise Price, Ending Balance | 32.13 | 30.38 | 27.98
Weighted-Average Grant Date Fair Value, Beginning Balance | 7.36 | 6.98 | 6.35
Weighted-Average Grant Date Fair Value, Granted | 8.49 | 7.71 | 7.78
Weighted-Average Grant Date Fair Value, Exercised | 6.29 | 6.31 | 5.53
Weighted-Average Grant Date Fair Value, Forfeited | 8.02 | 7.2 | 7.1
Weighted-Average Grant Date Fair Value, Ending Balance | $ 7.66 | $ 7.36 | $ 6.98

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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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- 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 per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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