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Stock-based Payment Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Oct. 31, 2017
Jul. 31, 2017
Shares    
Outstanding as of July 31, 2017 18,774,000  
Grants of options (in shares) 2,108,000  
Exercises (in shares) (672,000)  
Forfeitures or expirations (in shares) (19,000)  
Outstanding as of October 31, 2017 20,191,000 18,774,000
Exercisable as of October 31, 2017 12,263,000  
Weighted Average Exercise Price    
Outstanding as of July 31, 2017 $ 17.14  
Grants of options (in dollars per share) 35.74  
Exercises (in dollars per share) 13.78  
Forfeitures or expirations (in dollars per share) 17.71  
Outstanding as of October 31, 2017 19.19 $ 17.14
Exercisable as of October 31, 2017 $ 16.26  
Weighted Average Remaining Contractual Term (In years)    
Outstanding as of July 31, 2017   6 years 5 months 23 days
Outstanding as of October 31, 2017 6 years 7 months 28 days  
Exercisable as of October 31, 2017 5 years 9 months 29 days  
Aggregate Intrinsic Value    
Outstanding as of July 31, 2017 $ 269,449  
Outstanding as of October 31, 2017 345,304 $ 269,449
Exercisable as of October 31, 2017 $ 245,676