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Stockholders' Equity (Additional Information) (Details 3) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Aug. 31, 2017 | Aug. 31, 2016
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |
Shares available for issuance under share based compensation plan | 12,228,936 | 4,898,739
2016 Share Repurchase Program [Member] |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |
Share repurchase program, amount authorized | $ 400.0 |
Share repurchase program, remaining authorized repurchase amount | 400.0 |
2017 Share Repurchase Program [Member] |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |
Share repurchase program, amount authorized | 450.0 |
Share repurchase program, remaining authorized repurchase amount | $ 449.9 |
Performance-based restricted stock units [Member] |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |
Restricted stock units awarded | 600,000 |
Time-based restricted stock units [Member] |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |
Award vesting period | 3 years |
Restricted stock units awarded | 1,800,000 |
Market based restricted stock units [Member] |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |
Restricted stock units awarded | 400,000 |
Possibility One | Performance-based restricted stock units [Member] |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |
Award vesting period | 3 years |
Possibility One | Maximum | Performance-based restricted stock units [Member] |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |
Award vesting percentage | 100.00% |
Possibility Two | Performance-based restricted stock units [Member] |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |
Award vesting period | 5 years |
Award vesting percentage maximum | 150.00% |
Plan 2011 |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |
Eligibility period for employees to participate in ESPP | 90 days |
Shares available for issuance under share based compensation plan | 12,000,000 |
Plan 2011 | Employee Stock Purchase Plan [Member] |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |
Percentage for fair market value fixed for pricing | 85.00% |
Plan 2011 | Employee Stock Purchase Plan [Member] | Maximum |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |
Maximum percentage of an employees salary that can be used to purchase shares under the ESPP | 10.00% |

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