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Stockholders' Equity (Employee Stock Purchase Plan, Additional Information) (Details) - shares | 12 Months Ended |
--- | --- | ---
Aug. 31, 2018 | Aug. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for issuance under share based compensation plan | 12,837,158 | 12,228,936
the ESPP |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Maximum aggregate number of shares subject to awards | 12,000,000 |
Shares available for issuance under share based compensation plan | 4,679,061 |
Eligibility period for employees to participate in ESPP | 90 days |
the ESPP | Employee stock purchase plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Maximum percentage of an employees salary that can be used to purchase shares under the ESPP | 10.00% |
Percentage for fair market value fixed for pricing | 85.00% |

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- Definition Period for which an employee must be employed by the Company to be eligible to participate in the employee stock purchase plan. + References No definition available. + 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 highest percentage of annual salary that an employee is permitted to utilize with respect to the 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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