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Stock-Based Compensation - Summary of Significant Ranges of Outstanding and Exercisable Stock Options (Details) - Stock Options
shares in Thousands
12 Months Ended
Oct. 31, 2018
$ / shares
shares
Options Outstanding  
Shares Outstanding | shares 7,086
Weighted- Average Remaining Contractual Term
Weighted- Average Exercise Price (in dollars per share)
Options Exercisable  
Shares Exercisable | shares 4,707
Weighted- Average Exercise Price (in dollars per share)
$0-$9.99  
Range of Exercise Prices  
Lower range limit (in dollars per share) 0
Upper range limit (in dollars per share) $ 9.99
Options Outstanding  
Shares Outstanding | shares 451
Weighted- Average Remaining Contractual Term 2 years 3 months 12 days
Weighted- Average Exercise Price (in dollars per share) $ 7
Options Exercisable  
Shares Exercisable | shares 451
Weighted- Average Exercise Price (in dollars per share) $ 7
$10-$19.99  
Range of Exercise Prices  
Lower range limit (in dollars per share) 10
Upper range limit (in dollars per share) $ 19.99
Options Outstanding  
Shares Outstanding | shares 6,522
Weighted- Average Remaining Contractual Term 4 years 3 months 12 days
Weighted- Average Exercise Price (in dollars per share) $ 14
Options Exercisable  
Shares Exercisable | shares 4,143
Weighted- Average Exercise Price (in dollars per share) $ 14
$20-$29.99  
Range of Exercise Prices  
Lower range limit (in dollars per share) 20
Upper range limit (in dollars per share) $ 29.99
Options Outstanding  
Shares Outstanding | shares 113
Weighted- Average Remaining Contractual Term 5 years 3 months 12 days
Weighted- Average Exercise Price (in dollars per share) $ 23
Options Exercisable  
Shares Exercisable | shares 113
Weighted- Average Exercise Price (in dollars per share) $ 23