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Stock Repurchases (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Oct. 31, 2016
Jul. 31, 2016
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]    
Options Exercised 9,689,000  
Weighted Average Exercise Price $ 15.74  
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