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Stockholders' Equity and Stock-based Compensation (Details 3) - Restricted stock units RSUs [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Number of RSUs Outstanding (in shares)      
Balance at beginning of period (in shares) 2,727,724 2,882,674 3,384,221
Granted (in shares) 1,542,235 1,586,192 1,664,413
Released (in shares) (1,372,770) (1,408,746) (1,819,825)
Canceled (in shares) (263,104) (332,396) (346,135)
Balance at end of period (in shares) 2,634,085 2,727,724 2,882,674
Expected to vest as of July 31, 2016 (in shares) 2,465,394    
Weighted Average Grant Date Fair Value (in dollars per share)      
Balance at beginning of period (in USD per share) $ 50.08 $ 42.65 $ 30.70
Granted (in USD per share) 61.22 54.99 47.50
Released (in USD per share) 49.38 41.21 25.99
Canceled (in USD per share) 53.53 46.71 36.72
Balance at end of period (in USD per share) 56.62 $ 50.08 $ 42.65
Expected to vest as of July 31, 2016 (in USD per share) $ 56.40    
Aggregate Intrinsic Value (1)      
Balance at beginning of period $ 167,673 $ 170,222 $ 137,061
Released 81,427 78,763 88,648
Balance at end of period 190,076 $ 167,673 $ 170,222
Expected to vest as of July 31, 2017 $ 177,903