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Stockholder's Equity (Details 4) - Stock Options
12 Months Ended
Jul. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding at July 31, 2018 (in shares) | shares 17,797,000
Weighted-Average Remaining Contractual Life 6 years 2 months 9 days
Weighted- Average Exercise Price, Options Outstanding $ 20.29
Number Exercisable at July 31, 2018 (in shares) | shares 12,281,000
Weighted-Average Exercise Price, Options Exercisable $ 17.41
$8.19–$17.64  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range 6.54
Exercise price upper range $ 10.28
Number Outstanding at July 31, 2018 (in shares) | shares 1,789,000
Weighted-Average Remaining Contractual Life 3 years 3 months 18 days
Weighted- Average Exercise Price, Options Outstanding $ 11.44
Number Exercisable at July 31, 2018 (in shares) | shares 1,726,000
Weighted-Average Exercise Price, Options Exercisable $ 11.25
$17.73–$17.81  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range 10.52
Exercise price upper range $ 17.73
Number Outstanding at July 31, 2018 (in shares) | shares 9,451,000
Weighted-Average Remaining Contractual Life 5 years 9 months
Weighted- Average Exercise Price, Options Outstanding $ 17.79
Number Exercisable at July 31, 2018 (in shares) | shares 7,526,000
Weighted-Average Exercise Price, Options Exercisable $ 17.80
$18.06–$18.61  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range 17.81
Exercise price upper range $ 18.23
Number Outstanding at July 31, 2018 (in shares) | shares 2,770,000
Weighted-Average Remaining Contractual Life 6 years 22 days
Weighted- Average Exercise Price, Options Outstanding $ 18.33
Number Exercisable at July 31, 2018 (in shares) | shares 2,088,000
Weighted-Average Exercise Price, Options Exercisable $ 18.29
$18.84–$50.30  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range 18.32
Exercise price upper range $ 31.24
Number Outstanding at July 31, 2018 (in shares) | shares 3,787,000
Weighted-Average Remaining Contractual Life 8 years 8 months 27 days
Weighted- Average Exercise Price, Options Outstanding $ 32.14
Number Exercisable at July 31, 2018 (in shares) | shares 941,000
Weighted-Average Exercise Price, Options Exercisable $ 23.73