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Stock-based Payment Compensation (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jan. 31, 2016
USD ($)
$ / shares
shares
Jul. 31, 2015
USD ($)
$ / shares
shares
Shares    
Outstanding as of July 31, 2015 | shares 21,224,000 21,011,000
Grants of options (in shares) | shares 370,000  
Exercises (in shares) | shares (100,000)  
Forfeitures or expirations (in shares) | shares (56,600.0)  
Exercisable as of January 31, 2016 | shares 15,204,000  
Weighted Average Exercise Price    
Outstanding as of July 31, 2015 $ 23.65  
Grants of options (in dollars per share) 38.50  
Exercises (in dollars per share) 17.42  
Forfeitures or expirations (in dollars per share) 35.88  
Outstanding as of January 31, 2016 23.91 $ 23.65
Exercisable as of January 31, 2016 $ 19.24  
Weighted Average Remaining Contractual Term (In years)    
Outstanding as of July 31, 2015   5 years 9 months 11 days
Outstanding as of January 31, 2016 5 years 4 months 13 days  
Exercisable as of January 31, 2016 4 years 1 month 2 days  
Aggregate Intrinsic Value    
Outstanding as of July 31, 2015 | $ $ 261,339  
Outstanding as of January 31, 2016 | $ 223,358 $ 261,339
Exercisable as of January 31, 2016 | $ $ 221,706