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Stockholder's Equity (Details 4) - Jul. 31, 2015 - Stock Options - $ / shares
Total
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number Outstanding at July 31, 2015 (in shares) 21,011,000
Weighted-Average Remaining Contractual Life 5 years 9 months 11 days
Weighted- Average Exercise Price, Options Outstanding $ 23.65
Number Exercisable at July 31, 2015 (in shares) 14,396,000
Weighted-Average Exercise Price, Options Exercisable $ 18.38
$12.02–$17.20  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range 12.02
Exercise price upper range $ 17.20
Number Outstanding at July 31, 2015 (in shares) 10,484,000
Weighted-Average Remaining Contractual Life 3 years 7 months 10 days
Weighted- Average Exercise Price, Options Outstanding $ 15.42
Number Exercisable at July 31, 2015 (in shares) 10,464,000
Weighted-Average Exercise Price, Options Exercisable $ 15.42
$17.32–$21.05  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range 17.32
Exercise price upper range $ 21.05
Number Outstanding at July 31, 2015 (in shares) 2,122,000
Weighted-Average Remaining Contractual Life 4 years 10 months 24 days
Weighted- Average Exercise Price, Options Outstanding $ 19.83
Number Exercisable at July 31, 2015 (in shares) 1,942,000
Weighted-Average Exercise Price, Options Exercisable $ 19.76
$22.47–$35.45  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range 22.47
Exercise price upper range $ 35.45
Number Outstanding at July 31, 2015 (in shares) 2,503,000
Weighted-Average Remaining Contractual Life 8 years 11 months 12 days
Weighted- Average Exercise Price, Options Outstanding $ 32.29
Number Exercisable at July 31, 2015 (in shares) 594,000
Weighted-Average Exercise Price, Options Exercisable $ 25.21
$35.62–$37.22  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range 35.62
Exercise price upper range $ 37.22
Number Outstanding at July 31, 2015 (in shares) 5,902,000
Weighted-Average Remaining Contractual Life 8 years 7 months 10 days
Weighted- Average Exercise Price, Options Outstanding $ 35.99
Number Exercisable at July 31, 2015 (in shares) 1,396,000
Weighted-Average Exercise Price, Options Exercisable $ 35.71