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Stock-based Payment Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Oct. 31, 2018
Jul. 31, 2018
Shares    
Outstanding as of July 31, 2018 17,797,000  
Grants of options (in shares) 0  
Exercises (in shares) (62,000)  
Forfeitures or expirations (in shares) (37,000)  
Outstanding as of October 31, 2018 17,698,000 17,797,000
Exercisable as of October 31, 2018 13,387,000  
Weighted Average Exercise Price    
Outstanding as of July 31, 2018 $ 20.29  
Grants of options (in dollars per share) 0.00  
Exercises (in dollars per share) 19.93  
Forfeitures or expirations (in dollars per share) 19.10  
Outstanding as of October 31, 2018 20.29 $ 20.29
Exercisable as of October 31, 2018 $ 18.06  
Weighted Average Remaining Contractual Term (In years)    
Outstanding as of July 31, 2018   6 years 2 months 9 days
Outstanding as of October 31, 2018 5 years 10 months 28 days  
Exercisable as of October 31, 2018 5 years 4 months 17 days  
Aggregate Intrinsic Value    
Outstanding as of July 31, 2018 $ 660,268  
Outstanding as of October 31, 2018 506,512 $ 660,268
Exercisable as of October 31, 2018 $ 412,993