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Stockholder's Equity (Details 3) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jul. 31, 2015
Apr. 30, 2015
Oct. 31, 2014
Oct. 31, 2013
Jan. 31, 2013
Jul. 31, 2015
Number Of Options [Roll Forward]            
Exercise of stock options, net of repurchased shares (in shares) (200,000) (139,690) (201,333) (14,000) (73,228)  
Weighted Average Exercise Price [Roll Forward]            
Exercises (in dollars per share) $ 12.02 $ 20.27 $ 19.59 $ 16.43 $ 8.89  
Stock Options            
Number Of Options [Roll Forward]            
Outstanding at July 31, 2013 (in shares)     19,082,000     19,082,000
Grants of options (in shares)           2,891,000
Exercise of stock options, net of repurchased shares (in shares)           (749,000)
Forfeitures or expirations (in shares)           (213,000)
Outstanding at July 31, 2014 (in shares) 21,011,000         21,011,000
Exercisable at July 31, 2014 (in shares) 14,396,000         14,396,000
Vested and expected to vest at July 31, 2014 (in shares) 20,542,000         20,542,000
Weighted Average Exercise Price [Roll Forward]            
Outstanding at July 31, 2013 (in dollars per share)     $ 21.64     $ 21.64
Grants of options (in dollars per share)           35.95
Exercises (in dollars per share)           17.11
Forfeitures or expirations (in dollars per share)           33.40
Outstanding at July 31, 2014 (in dollars per share) $ 23.65         23.65
Exercisable at July 31, 2015 (in dollars per share) 18.38         18.38
Vested and expected to vest at July 31, 2014 (in dollars per share) $ 23.39         $ 23.39
Weighted-Average Remaining Contractual Term [Roll Forward]            
Outstanding at July 31, 2014           6 years 4 days
Outstanding at July 31, 2015           5 years 9 months 11 days
Exercisable at July 31, 2015           4 years 4 months 13 days
Vested and expected to vest at July 31, 2014           5 years 8 months 19 days
Aggregate Intrinsic Value [Roll Forward]            
Outstanding at July 31, 2014     $ 235,734     $ 235,734
Outstanding at July 31, 2015 $ 261,339         261,339
Exercisable at July 31, 2015 254,158         254,158
Vested and expected to vest at July 31, 2015 $ 260,845         $ 260,845