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Share-based Payments - Stock Options (Details) - Stock Incentive Plan - $ / shares shares in Millions | 12 Months Ended |
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Aug. 31, 2024 | Aug. 31, 2023 | Aug. 31, 2022 | Aug. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Beginning of period, Outstanding (in shares) | 1.0 | 1.1 | 1.2 |
Exercised (less than) (in shares) | (0.1) | (0.1) | (0.1) |
Forfeitures (in shares) |  | (0.1) |  |
End of period, Outstanding (in shares) | 0.9 | 1.0 | 1.1 |
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) | $ 131.81 | $ 132.50 | $ 127.98 |
Exercised (in dollars per share) | 143.92 | 126.92 | 88.94 |
Forfeitures (in dollars per share) |  | 227.15 |  |
End of period, Outstanding (in dollars per share) | $ 130.74 | $ 131.81 | $ 132.50 |
Outstanding, Number of Shares (in shares) | 0.9 | 0.9 | 0.6 | 0.5
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 132.48 | $ 135.91 | $ 143.15 | $ 142.36
$100.00 - $160.00 (average life - 5.5 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) | 100.00 |  |  |
Range of option exercise prices, upper range limit (in dollars per share) | $ 160.00 |  |  |
Range of option exercise prices, average life | 5 years 6 months |  |  |
Range of option exercise prices, Outstanding, Number of Shares (in shares) | 0.8 |  |  |
Range of option exercise prices, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 118.70 |  |  |
Range of option exercise prices, Exercisable, Number of Shares (in shares) | 0.8 |  |  |
Range of option exercise prices, Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 119.58 |  |  |
$160.01 - $210.00 (average life - 1.2 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 | 1 year 2 months 12 days |  |  |
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 |  |  |
$210.01 - $239.76 (average life - 2.1 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 | 2 years 1 month 6 days |  |  |
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) | $ 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 |  |  |

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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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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