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Stockholders' Equity (Restricted Stock Awards, Additional Information) (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Nov. 30, 2017 | Aug. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost | $ 24.9 |
Restricted stock awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number | 0.8 |
Performance-based restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period |  | 3 years
Performance-based restricted stock units | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting percentage |  | 150.00%
Time-based restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period |  | 3 years
Market-based restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period |  | 3 years
Award vesting percentage |  | 200.00%

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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=109197908&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 An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + 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 (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of shares for which recognition of compensation cost was accelerated. + References No definition available. + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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=109197908&loc=d3e5070-113901 + Details
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