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Stockholders' Equity (Common Stock Outstanding) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Common stock outstanding, beginning balances (in shares) | 164,588,172 |  |  |
Common stock outstanding, ending balance (in shares) | 153,520,380 | 164,588,172 |  |
Share repurchase program, amount authorized |  | $ 350,000,000 | $ 450,000,000 | $ 400,000,000
Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Common stock outstanding, beginning balances (in shares) | 164,588,172 | 177,727,653 | 186,998,472 |
Shares issued upon exercise of stock options (in shares) | 11,348 | 30,832 | 172,620 |
Shares issued under employee stock purchase plan (in shares) | 1,282,042 | 1,105,400 | 1,228,316 |
Vesting of restricted stock (in shares) | 1,983,261 | 2,727,229 | 2,102,049 |
Purchases of treasury stock under employee stock plans (in shares) | (489,836) | (793,052) | (550,096) |
Treasury shares purchased (in shares) | (13,854,607) | (16,209,890) | (12,223,708) |
Common stock outstanding, ending balance (in shares) | 153,520,380 | 164,588,172 | 177,727,653 |

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