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Share-based Payments - Stock Options (Details) - $ / shares shares in Millions | 12 Months Ended |
--- | --- | ---
Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018
Stock options | $40.01 - $100.00 (average life - 1.1 years) |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |
Range of option exercise prices, lower range limit (in dollars per share) | $ 40.01 |  |  |
Range of option exercise prices, upper range limit (in dollars per share) | $ 100.00 |  |  |
Range of option exercise prices, average life | 1 year 1 month 6 days |  |  |
Stock options | $100.01 - $160.00 (average life - 7.9 years) |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |
Range of option exercise prices, lower range limit (in dollars per share) | $ 100.01 |  |  |
Range of option exercise prices, upper range limit (in dollars per share) | $ 160.00 |  |  |
Range of option exercise prices, average life | 7 years 10 months 24 days |  |  |
Stock options | $160.01 - $210.00 (average life - 4.2 years) |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |
Range of option exercise prices, lower range limit (in dollars per share) | $ 160.01 |  |  |
Range of option exercise prices, upper range limit (in dollars per share) | $ 210.00 |  |  |
Range of option exercise prices, average life | 4 years 2 months 12 days |  |  |
Stock options | $210.01 - $239.76 (average life - 5.1 years) |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |
Range of option exercise prices, lower range limit (in dollars per share) | $ 210.01 |  |  |
Range of option exercise prices, upper range limit (in dollars per share) | $ 239.76 |  |  |
Range of option exercise prices, average life | 5 years 1 month 6 days |  |  |
Stock Incentive Plan | $40.01 - $100.00 (average life - 1.1 years) |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |
Range of option exercise prices, Outstanding, Number of Shares (in shares) | 0.1 |  |  |
Range of option exercise prices, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 62.54 |  |  |
Range of option exercise prices, Exercisable, Number of Shares (in shares) | 0.1 |  |  |
Range of option exercise prices, Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 62.54 |  |  |
Stock Incentive Plan | $100.01 - $160.00 (average life - 7.9 years) |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |
Range of option exercise prices, Outstanding, Number of Shares (in shares) | 1.0 |  |  |
Range of option exercise prices, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 119.18 |  |  |
Range of option exercise prices, Exercisable, Number of Shares (in shares) | 0.3 |  |  |
Range of option exercise prices, Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 125.13 |  |  |
Stock Incentive Plan | $160.01 - $210.00 (average life - 4.2 years) |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |
Range of option exercise prices, Outstanding, Number of Shares (in shares) | 0.1 |  |  |
Range of option exercise prices, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 207.80 |  |  |
Range of option exercise prices, Exercisable, Number of Shares (in shares) | 0.1 |  |  |
Range of option exercise prices, Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 207.80 |  |  |
Stock Incentive Plan | $210.01 - $239.76 (average life - 5.1 years) |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |
Range of option exercise prices, Outstanding, Number of Shares (in shares) | 0.0 |  |  |
Range of option exercise prices, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 239.76 |  |  |
Range of option exercise prices, Exercisable, Number of Shares (in shares) | 0.1 |  |  |
Range of option exercise prices, Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 239.76 |  |  |
Stock Incentive Plan | Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Beginning of period, Outstanding (in shares) | 0.9 | 0.4 | 0.3 |
Granted (in shares) | 0.3 | 0.5 | 0.1 |
Exercised (in shares) | 0.0 | 0.0 |  |
End of period, Outstanding (in shares) | 1.2 | 0.9 | 0.4 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Beginning of period, Outstanding (in dollars per share) | $ 133.19 | $ 146.70 | $ 154.69 |
Granted (in dollars per share) | 108.96 | 121.87 | 116.40 |
Exercised (in dollars per share) | 108.58 | 116.36 |  |
End of period, Outstanding (in dollars per share) | $ 127.98 | $ 133.19 | $ 146.70 |
Outstanding, Number of Shares (in shares) | 0.5 | 0.4 | 0.3 | 0.2
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 142.36 | $ 151.07 | $ 147.51 | $ 134.13

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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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