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Share-Based Payments (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017 | Jan. 31, 2018 | Aug. 31, 2016
Share-based Compensation Arrangement, Restricted Stock Awards [Abstract] |  |  |  |  |
Share-based expense | $ 29,200,000 | $ 32,300,000 | $ 32,000,000.0 |  |
Stock Options | $40.01 - $100.00 (average life - 3.1 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 | 3 years 1 month |  |  |  |
Stock Options | $100.01 - $160.00 (average life - 6.9 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 |  |  |  |
Range of option exercise prices: average life | 6 years 10 months 24 days |  |  |  |
Stock Options | $160.01 - $210.00 (average life - 6.2 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 | 6 years 2 months 12 days |  |  |  |
Stock Options | $210.01 - $239.76 (average life - 7.1 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 | 7 years 1 month |  |  |  |
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) | 0 |  |  |  |
Weighted Average Grant Date Fair Value Per Share [Roll Forward] |  |  |  |  |
Forfeited, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | $ 159.88 |  |  |  |
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) | 1,400,000 | 1,600,000 | 1,400,000 |  |
Stock Incentive Plan | $40.01 - $100.00 (average life - 3.1 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 - 6.9 years) |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |  |
Range of option exercise prices: Number of Shares, Outstanding | 200,000 |  |  |  |
Range of option exercise prices: Weighted Average Exercise Price, Outstanding (in dollars per share) | $ 125.66 |  |  |  |
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) | $ 125.09 |  |  |  |
Stock Incentive Plan | $160.01 - $210.00 (average life - 6.2 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 - 7.1 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) | $ 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 | Stock Options |  |  |  |  |
Share-based Compensation Arrangement, Restricted Stock Awards [Abstract] |  |  |  |  |
Share-based compensation vesting period (years) | 3 years |  |  |  |
Share-based expense | $ 2,700,000 | $ 3,100,000 | $ 3,600,000 |  |
Weighted Average Grant Date Fair Value Per Share [Roll Forward] |  |  |  |  |
Unrecognized compensation cost | $ 2,800,000 |  |  |  |
Unrecognized compensation cost period of recognition (years) | 1 year 3 months 18 days |  |  |  |
Share-based Compensation Arrangement, Stock Options [Abstract] |  |  |  |  |
Share-based compensation, expiration period | 10 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |  |
Dividend yield | 0.40% | 0.30% | 0.20% |  |
Expected volatility | 32.80% | 30.90% | 28.50% |  |
Risk-free interest rate | 3.00% | 2.00% | 1.30% |  |
Expected life of options | 4 years | 4 years | 4 years |  |
Weighted-average fair value of options (in dollars per share) | $ 34.06 | $ 41.87 | $ 57.40 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Beginning of period, Outstanding, Number of Shares | 300,000 | 300,000 | 300,000 |  |
Granted, Number of Shares | 100,000 | 0 | 0 |  |
Stock options exercised (in shares) | 0 | 0 | 0 |  |
End of period, Outstanding, Number of Shares | 420,000 | 300,000 | 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) | $ 154.69 | $ 156.43 | $ 129.85 |  |
Granted, Weighted average exercise price (in dollars per share) | 116.40 | 156.39 | 239.76 |  |
Exercised, Weighted average exercise price (in dollars per share) |  | 115.27 | 139.69 |  |
End of period, Outstanding, Weighted average exercise price (in dollars per share) | $ 146.70 | $ 154.69 | $ 156.43 |  |
Exercisable, Number of shares outstanding (in shares) | 300,000 | 200,000 | 200,000 |  | 100,000
Exercisable, Weighted average exercise price (in dollars per share) | $ 147.51 | $ 134.13 | $ 106.54 |  | $ 83.89
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |  |
Total intrinsic value of stock options expected to vest |  | $ 500,000 | $ 1,300,000 |  |
Stock options exercised (in shares) | 0 | 0 | 0 |  |
Total intrinsic value of stock options outstanding | $ 5,800,000 |  |  |  |
Total intrinsic value of stock options expected to vest | 700,000 |  |  |  |
Total intrinsic value of stock options exercisable | $ 5,100,000 |  |  |  |
Stock Incentive Plan | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement, Restricted Stock Awards [Abstract] |  |  |  |  |
Share-based compensation vesting period (years) | 4 years |  |  |  |
Share-based expense | $ 25,100,000 | $ 27,900,000 | $ 27,200,000 |  |
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 |  |  |  |
Granted (in shares) | 200,000 |  |  |  |
Vested (in shares) | (200,000) |  |  |  |
End of period, Outstanding (in shares) | 350,000 | 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) | $ 186.63 |  |  |  |
Granted, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | 120.73 |  |  |  |
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | 184.60 |  |  |  |
End of period, Outstanding, Weighted Average Grant Date Fair Value Per Share (in dollars per share) | $ 156.32 | $ 186.63 |  |  |
Unrecognized compensation cost | $ 34,600,000 |  |  |  |
Unrecognized compensation cost period of recognition (years) | 1 year 7 months 6 days |  |  |  |
Total fair value of shares vested | $ 26,900,000 | $ 26,600,000 | 24,800,000 |  |
Supplemental Deferred Savings Plan | Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement, Restricted Stock Awards [Abstract] |  |  |  |  |
Share-based expense | $ 0 | $ 0 | $ 0 |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |  |
Deferred compensation, number of share units outstanding | 9,000 |  |  |  |
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) | 360,000 | 370,000 | 390,000 |  |
Share-based Compensation Arrangement, Restricted Stock Awards [Abstract] |  |  |  |  |
Share-based expense | $ 1,400,000 | $ 1,300,000 | $ 1,200,000 |  |
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract] |  |  |  |  |
Deferred compensation, number of share units outstanding | 119,000 |  |  |  |
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% |  |  |  |

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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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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)(2) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own 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 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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=116856206&loc=d3e5070-113901 + Details
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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=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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