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Stockholders' Equity (Share Repurchases) (Details) - USD ($) shares in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Aug. 31, 2018 | Jun. 30, 2018 | Aug. 31, 2017 | Aug. 31, 2016
2016 Share Repurchase Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share repurchase program, amount authorized |  |  |  | $ 400,000,000
2017 Share Repurchase Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share repurchase program, amount authorized |  |  | $ 450,000,000 |
2018 Share Repurchase Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share repurchase program, amount authorized |  | $ 350,000,000 |  |
Shares repurchased (in shares) | 0.0 |  |  |
Share repurchase program, remaining authorized repurchase amount | $ 350,000,000 |  |  |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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