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Share-based Payments - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018 | Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment expense | $ 32,500,000 | $ 38,200,000 | $ 29,200,000 |  |
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) | 300,000 | 700,000 | 1,400,000 |  |
Age to be attained allowing for continued vesting |  | 60 years |  |  |
Years of service eligible for continued vesting | 5 years | 10 years |  |  |
Share-based payment expense | $ 32,500,000 | $ 38,200,000 | $ 29,200,000 |  |
Stock Incentive Plan | Restricted stock awards and units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares outstanding of restricted stock (in shares) | 400,000 | 400,000 | 400,000 | 400,000 |
Share-based compensation vesting period (years) | 4 years |  |  |  |
Unrecognized compensation cost | $ 28,100,000 |  |  |  |
Unrecognized compensation cost period of recognition (years) | 1 year 9 months 18 days |  |  |  |
Fair value of shares vested | $ 19,500,000 | $ 22,800,000 | $ 26,900,000 |  |
Granted (in shares) | 200,000 | 200,000 | 200,000 |  |
Share-based payment expense | $ 15,100,000 | $ 24,600,000 | $ 25,100,000 |  |
Stock Incentive Plan | Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost | $ 17,000,000 |  |  |  |
Unrecognized compensation cost period of recognition (years) | 2 years 2 months 12 days |  |  |  |
Stock options outstanding (in shares) | 1,200,000 | 900,000 | 400,000 | 300,000 |
Award expiration term | 10 years |  |  |  |
Intrinsic value of options exercised | $ 1,200,000 |  | $ 0 |  |
Total intrinsic value of stock options outstanding | 70,900,000 |  |  |  |
Total intrinsic value of stock options expected to vest | 42,800,000 |  |  |  |
Total intrinsic value of stock options exercisable | 27,400,000 |  |  |  |
Share-based payment expense | $ 9,200,000 | $ 4,900,000 | $ 2,700,000 |  |
Stock Incentive Plan | Stock options | Service Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation vesting period (years) | 3 years |  |  |  |
Stock options outstanding (in shares) | 800,000 |  |  |  |
Granted (in shares) | 0 |  |  |  |
Stock Incentive Plan | Stock options | Market Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation vesting period (years) | 4 years |  |  |  |
Stock options outstanding (in shares) | 400,000 |  |  |  |
Granted (in shares) |  |  | 0 |  |
Stock Incentive Plan | Performance stock units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment expense | $ 6,800,000 | 7,300,000 | $ 0 |  |
Supplemental Deferred Savings Plan | Performance stock units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares outstanding of restricted stock (in shares) | 100,000 |  |  |  |
Share-based compensation vesting period (years) | 3 years |  |  |  |
Unrecognized compensation cost | $ 3,800,000 |  |  |  |
Unrecognized compensation cost period of recognition (years) | 1 year 6 months |  |  |  |
Supplemental Deferred Savings Plan | Employee Deferred Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares vested (in shares) | 7,000 |  |  |  |
Share-based payment expense | $ 0 | $ 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) | 300,000 | 300,000 | 400,000 |  |
Shares vested (in shares) | 100,000 |  |  |  |
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 |  |  |  |
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=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=122041274&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 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 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 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 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=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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=120381028&loc=d3e5070-113901 + Details
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