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Summary of Stock Options Outstanding (Detail) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
May 31, 2020 | May 31, 2019 | May 31, 2018 | May 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number | 2,162,000 | 2,385,000 | 2,499,000 | 2,699,000
Options Outstanding, Average Contractual Life | 3 years |  |  |
Options Outstanding, Weighted-Average Exercise Price | $ 55.96 | $ 49.37 | $ 42.63 | $ 32.88
Options Exercisable, Number | 486,000 | 617,000 | 508,000 | 661,000
Options Exercisable, Weighted Average Exercise Price | $ 48.94 | $ 40.68 |  |
$16.82 - $40.91 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise price, minimum | 16.82 |  |  |
Range of Exercise price, maximum | $ 40.91 |  |  |
Options Outstanding, Number | 507,000 |  |  |
Options Outstanding, Average Contractual Life | 1 year 4 months 24 days |  |  |
Options Outstanding, Weighted-Average Exercise Price | $ 37.26 |  |  |
Options Exercisable, Number | 208,000 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 34.94 |  |  |
$40.92 - $61.56 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise price, minimum | 40.92 |  |  |
Range of Exercise price, maximum | $ 61.56 |  |  |
Options Outstanding, Number | 605,000 |  |  |
Options Outstanding, Average Contractual Life | 2 years 7 months 6 days |  |  |
Options Outstanding, Weighted-Average Exercise Price | $ 58.59 |  |  |
Options Exercisable, Number | 183,000 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 57.43 |  |  |
$61.57 - $62.88 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise price, minimum | 61.57 |  |  |
Range of Exercise price, maximum | $ 62.88 |  |  |
Options Outstanding, Number | 465,000 |  |  |
Options Outstanding, Average Contractual Life | 3 years 6 months |  |  |
Options Outstanding, Weighted-Average Exercise Price | $ 62.70 |  |  |
Options Exercisable, Number | 85,000 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 62.70 |  |  |
$62.89 - $64.05 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise price, minimum | 62.89 |  |  |
Range of Exercise price, maximum | $ 64.05 |  |  |
Options Outstanding, Number | 539,000 |  |  |
Options Outstanding, Average Contractual Life | 4 years 4 months 24 days |  |  |
Options Outstanding, Weighted-Average Exercise Price | $ 63.90 |  |  |
Options Exercisable, Number | 0 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 0 |  |  |
$64.06 - $68.96 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise price, minimum | 64.06 |  |  |
Range of Exercise price, maximum | $ 68.96 |  |  |
Options Outstanding, Number | 46,000 |  |  |
Options Outstanding, Average Contractual Life | 3 years 7 months 6 days |  |  |
Options Outstanding, Weighted-Average Exercise Price | $ 66.48 |  |  |
Options Exercisable, Number | 10,000 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 67.98 |  |  |

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- 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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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=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 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 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 (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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