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Share-Based Payments (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018 | Jan. 31, 2018 | Aug. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment expense | $ 38,200,000 | $ 29,200,000 | $ 32,300,000 |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Forfeited (in shares) | (100,000) | 0 |  |  |
Weighted Average Grant Date Fair Value Per Share [Roll Forward] |  |  |  |  |
Forfeited, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | $ 135.43 | $ 159.88 |  |  |
Stock Options | $40.01 - $100.00 (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) | 40.01 |  |  |  |
Range of option exercise prices: upper range limit (in dollars per share) | $ 100 |  |  |  |
Range of option exercise prices: average life | 2 years 1 month 6 days |  |  |  |
Stock Options | $100.01 - $160.00 (average life - 8.3 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 |  |  |  |
Range of option exercise prices: average life | 8 years 3 months 19 days |  |  |  |
Stock Options | $160.01 - $210.00 (average life - 5.2 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 |  |  |  |
Range of option exercise prices: average life | 5 years 2 months 12 days |  |  |  |
Stock Options | $210.01 - $239.76 (average life - 6.1 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 | 6 years 1 month 6 days |  |  |  |
Stock Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized for issuance (in shares) |  |  |  | 2,700,000 |
Number of shares available for grant (in shares) | 700,000 | 1,400,000 | 1,600,000 |  |
Years of service eligible for continued vesting | 60 years |  |  |  |
Age to be attained allowing for continued vesting | 10 years |  |  |  |
Share-based payment expense | $ 38,200,000 | $ 29,200,000 | $ 32,300,000 |  |
Stock Incentive Plan | $40.01 - $100.00 (average life - 2.1 years) |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |  |
Range of option exercise prices: Number of Shares, Outstanding | 100,000 |  |  |  |
Range of option exercise prices: Weighted Average Exercise Price, Outstanding (in dollars per share) | $ 62.25 |  |  |  |
Range of option exercise prices: Number of Shares, Exercisable | 100,000 |  |  |  |
Range of option exercise prices: Weighted Average Exercise Price, Exercisable (in dollars per share) | $ 62.25 |  |  |  |
Stock Incentive Plan | $100.01 - $160.00 (average life - 8.3 years) |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |  |
Range of option exercise prices: Number of Shares, Outstanding | 700,000 |  |  |  |
Range of option exercise prices: Weighted Average Exercise Price, Outstanding (in dollars per share) | $ 123.01 |  |  |  |
Range of option exercise prices: Number of Shares, Exercisable | 200,000 |  |  |  |
Range of option exercise prices: Weighted Average Exercise Price, Exercisable (in dollars per share) | $ 126.16 |  |  |  |
Stock Incentive Plan | $160.01 - $210.00 (average life - 5.2 years) |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |  |
Range of option exercise prices: Number of Shares, Outstanding | 100,000 |  |  |  |
Range of option exercise prices: Weighted Average Exercise Price, Outstanding (in dollars per share) | $ 207.80 |  |  |  |
Range of option exercise prices: Number of Shares, Exercisable | 100,000 |  |  |  |
Range of option exercise prices: Weighted Average Exercise Price, Exercisable (in dollars per share) | $ 207.80 |  |  |  |
Stock Incentive Plan | $210.01 - $239.76 (average life - 6.1 years) |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |  |
Range of option exercise prices: Number of Shares, Outstanding | 0 |  |  |  |
Range of option exercise prices: Weighted Average Exercise Price, Outstanding (in dollars per share) | $ 239.76 |  |  |  |
Range of option exercise prices: Number of Shares, Exercisable | 0 |  |  |  |
Range of option exercise prices: Weighted Average Exercise Price, Exercisable (in dollars per share) | $ 239.76 |  |  |  |
Stock Incentive Plan | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment expense | $ 24,600,000 | $ 25,100,000 | $ 27,900,000 |  |
Share-based Compensation Arrangement, Restricted Stock Awards [Abstract] |  |  |  |  |
Share-based compensation vesting period (years) | 4 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Beginning of period, Outstanding (in shares) | 400,000 | 400,000 | 400,000 |  |
Granted (in shares) | 200,000 | 200,000 | 200,000 |  |
Vested (in shares) | (100,000) | (200,000) | (200,000) |  |
End of period, Outstanding (in shares) | 350,000 | 400,000 | 400,000 |  |
Weighted Average Grant Date Fair Value Per Share [Roll Forward] |  |  |  |  |
Beginning of period, Outstanding, Weighted Average Grant date Fair Value Per Share (in dollars per share) | $ 156.32 | $ 186.63 | $ 197.41 |  |
Granted, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | 122.10 | 120.73 | 154.95 |  |
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | 171.92 | 184.60 | 177.79 |  |
End of period, Outstanding, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | $ 134.68 | $ 156.32 | $ 186.63 |  |
Unrecognized compensation cost | $ 26,200,000 |  |  |  |
Unrecognized compensation cost period of recognition (years) | 1 year 7 months 6 days |  |  |  |
Total fair value of shares vested | $ 22,800,000 | $ 26,900,000 | $ 26,600,000 |  |
Stock Incentive Plan | Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment expense | $ 4,900,000 | $ 2,700,000 | $ 3,100,000 |  |
Share-based Compensation Arrangement, Restricted Stock Awards [Abstract] |  |  |  |  |
Share-based compensation vesting period (years) | 3 years |  |  |  |
Weighted Average Grant Date Fair Value Per Share [Roll Forward] |  |  |  |  |
Unrecognized compensation cost | $ 15,200,000 |  |  |  |
Unrecognized compensation cost period of recognition (years) | 1 year 10 months 24 days |  |  |  |
Share-based Compensation Arrangement, Stock Options [Abstract] |  |  |  |  |
Award expiration term | 10 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Beginning of period, Outstanding, Number of Shares | 400,000 | 300,000 | 300,000 |  |
Granted, Number of Shares | 500,000 | 100,000 | 0 |  |
Stock options exercised (in shares) | 0 | 0 | 0 |  |
End of period, Outstanding, Number of Shares | 915,000 | 400,000 | 300,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |  |
Beginning of period, Outstanding, Weighted average exercise price (in dollars per share) | $ 146.70 | $ 154.69 | $ 156.43 |  |
Granted, Weighted average exercise price (in dollars per share) | 121.87 | 116.40 | 156.39 |  |
Exercised, Weighted average exercise price (in dollars per share) | 116.36 |  | 115.27 |  |
End of period, Outstanding, Weighted average exercise price (in dollars per share) | $ 133.19 | $ 146.70 | $ 154.69 |  |
Exercisable, Number of shares outstanding (in shares) | 400,000 | 300,000 | 200,000 |  | 200,000
Exercisable, Weighted average exercise price (in dollars per share) | $ 151.07 | $ 147.51 | $ 134.13 |  | $ 106.54
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |  |
Total intrinsic value of stock options expected to vest |  |  | $ 500,000 |  |
Stock options exercised (in shares) | 0 | 0 | 0 |  |
Total intrinsic value of stock options outstanding | $ 3,300,000 |  |  |  |
Total intrinsic value of stock options expected to vest | 0 |  |  |  |
Total intrinsic value of stock options exercisable | 3,300,000 |  |  |  |
Stock Incentive Plan | Performance stock units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment expense | 7,300,000 | $ 0 | $ 0 |  |
Stock Incentive Plan | Director share units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment expense | $ 1,400,000 | $ 1,400,000 | $ 1,300,000 |  |
Supplemental Deferred Savings Plan | Performance stock units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Beginning of period, Outstanding (in shares) | 0 | 0 |  |  |
End of period, Outstanding (in shares) | 67,000 | 0 | 0 |  |
Weighted Average Grant Date Fair Value Per Share [Roll Forward] |  |  |  |  |
Unrecognized compensation cost | $ 1,900,000 |  |  |  |
Unrecognized compensation cost period of recognition (years) | 2 years 1 month 6 days |  |  |  |
Supplemental Deferred Savings Plan | Employee Deferred Share Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment expense | $ 0 | $ 0 | $ 0 |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |  |
Deferred compensation, number of share units outstanding | 7,500 |  |  |  |
Supplemental Deferred Savings Plan | Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment expense |  | $ 0 | $ 0 |  |
Directors' Deferred Compensation Plan | Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares available for grant (in shares) | 320,000 | 360,000 | 370,000 |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |  |
Deferred compensation, number of share units outstanding | 98,000 |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized for issuance (in shares) | 1,500,000 |  |  |  |
Number of shares available for grant (in shares) | 1,000,000.0 |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |  |
Employee discount on purchases of common stock | 5.00% |  |  |  |
Service Options | Stock Incentive Plan | Stock Options |  |  |  |  |
Share-based Compensation Arrangement, Restricted Stock Awards [Abstract] |  |  |  |  |
Share-based compensation vesting period (years) | 3 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |  |
Dividend yield | 0.40% | 0.40% | 0.30% |  |
Expected volatility | 33.70% | 32.80% | 30.90% |  |
Risk-free interest rate | 1.30% | 3.00% | 2.00% |  |
Expected life of options | 5 years | 4 years | 4 years |  |
Weighted-average fair value of options (in dollars per share) | $ 34.22 | $ 34.06 | $ 41.87 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
End of period, Outstanding, Number of Shares | 815,000 |  |  |  |
Market Options | Stock Incentive Plan | Stock Options |  |  |  |  |
Share-based Compensation Arrangement, Restricted Stock Awards [Abstract] |  |  |  |  |
Share-based compensation vesting period (years) | 4 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Granted (in shares) |  | 0 | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |  |
Dividend yield | 0.40% |  |  |  |
Expected volatility | 33.70% |  |  |  |
Risk-free interest rate | 1.50% |  |  |  |
Expected life of options | 7 years |  |  |  |
Weighted-average fair value of options (in dollars per share) | $ 44.74 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
End of period, Outstanding, Number of Shares | 100,000 |  |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + 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 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit 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 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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