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Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2016 | Jul. 31, 2016 | Jan. 31, 2017
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract] |  |  |
Options Exercised |  |  | 9,892,000
Weighted Average Exercise Price |  |  | $ 16.07
Common Stock |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract] |  |  |
Options Exercised | 9,000,000 | 1,130,000 |
Weighted Average Exercise Price | $ 15.39 | $ 18.64 |
Shares Net Settled for Exercise | 2,704,486 | 410,648 |
Shares Withheld for Taxes(1) | 2,627,661 | 293,152 |
Net Shares to Employees | 3,667,853 | 426,200 |
Weighted Average Share Price for Withholding | $ 51.23 | $ 51.30 |
Tax Withholding (in 000s) | $ 134,615 | $ 15,039 |

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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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