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Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2018 | Oct. 31, 2016 | Jan. 31, 2018
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract] |  |  |
Options Exercised |  |  | 1,194,000
Weighted Average Exercise Price |  |  | $ 14.35
Common Stock |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract] |  |  |
Options Exercised | 80,000 | 18,000,000 |
Weighted Average Exercise Price | $ 6.54 | $ 7.70 |
Shares Net Settled for Exercise | 11,996 | 5,408,972 |
Shares Withheld for Taxes(1) | 0 | 5,255,322 |
Net Shares to Employees | 68,004 | 7,335,706 |
Weighted Average Share Price for Withholding | $ 43.60 | $ 25.62 |
Employee Stock Based Tax Withholding (in 000s) | $ 0 | $ 134,615 |

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- Definition Represents the number of net impact on number of shares settled resulting from exercise. + References No definition available. + Details
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