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Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2017
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract] |  |  |
Options Exercised |  |  | 20,598,000
Weighted Average Exercise Price |  |  | $ 8.19
Common Stock |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract] |  |  |
Options Exercised | 18,000,000 | 2,260,000 |
Weighted Average Exercise Price | $ 7.70 | $ 9.32 |
Shares Net Settled for Exercise | 5,408,972 | 821,296 |
Shares Withheld for Taxes(1) | 5,255,322 | 586,304 |
Net Shares to Employees | 7,335,706 | 852,400 |
Weighted Average Share Price for Withholding | $ 25.62 | $ 25.65 |
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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