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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Oct. 31, 2016
Jul. 31, 2016
Jul. 31, 2015
Apr. 30, 2015
Oct. 31, 2014
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]                
Options Exercised 18,000,000 2,260,000 400,000 279,380 402,666      
Exercise Price $ 7.70 $ 9.32 $ 6.01 $ 10.14 $ 9.80      
Shares Net Settled for Exercise 5,408,972 821,296 133,204 152,042 249,242      
Net Shares to Employee 5,255,322 586,304 104,316 41,312 70,832      
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 7,335,706 852,400 162,480 86,026 82,592      
Share Price for Withholding $ 25.62 $ 25.65 $ 18.04 $ 18.64 $ 15.83      
Tax Withholding (in 000's) $ 134,615 $ 15,039 $ 1,882 $ 770 $ 1,121 $ 135,433 $ 15,039 $ 3,822