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Stock-based Payment Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jan. 31, 2017
Jul. 31, 2016
Shares    
Grants of options (in shares) 428,000  
Exercises (in shares) (9,892,000)  
Forfeitures or expirations (in shares) (131,000)  
Exercisable as of January 31, 2017 5,728,000  
Outstanding as of 9,856,000 19,451,000
Weighted Average Exercise Price    
Outstanding as of July 31, 2016 $ 24.30  
Grants of options (in dollars per share) 55.02  
Exercises (in dollars per share) 16.07  
Forfeitures or expirations (in dollars per share) 36.22  
Outstanding as of January 31, 2017 33.75 $ 24.30
Exercisable as of January 31, 2017 $ 30.73  
Weighted Average Remaining Contractual Term (In years)    
Outstanding as of July 31, 2016   4 years 11 months 16 days
Outstanding as of January 31, 2017 6 years 10 months 6 days  
Exercisable as of January 31, 2017 6 years 1 month 21 days  
Aggregate Intrinsic Value    
Outstanding as of July 31, 2016 $ 508,401  
Outstanding as of January 31, 2017 226,630 $ 508,401
Exercisable as of January 31, 2017 $ 148,998