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Stock-based Payment Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Oct. 31, 2015
Jul. 31, 2015
Shares    
Outstanding as of July 31, 2015 20,989,000 21,011,000
Grants of options 10,000  
Exercises (31,000)  
Forfeitures or expirations (1,000)  
Exercisable as of October 31, 2015 14,802,000  
Weighted Average Exercise Price    
Outstanding as of July 31, 2015 $ 23.65  
Grants of options 34.94  
Exercises 12.02  
Forfeitures or expirations 35.45  
Outstanding as of October 31, 2015 23.67 $ 23.65
Exercisable as of October 31, 2015 $ 18.79  
Weighted Average Remaining Contractual Term (In years)    
Outstanding as of July 31, 2015 5 years 9 months 11 days  
Outstanding as of October 31, 2015 5 years 6 months 15 days  
Exercisable as of October 31, 2015 4 years 2 months 19 days  
Aggregate Intrinsic Value    
Outstanding as of July 31, 2015 $ 261,339  
Outstanding as of October 31, 2015 264,104 $ 261,339
Exercisable as of October 31, 2015 $ 257,895