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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, 2017
$ / shares
shares
Options Outstanding  
Shares Outstanding | shares 18,067
Weighted- Average Remaining Contractual Term 4 years 2 months 12 days
Weighted- Average Exercise Price (in dollars per share) $ 13
Options Exercisable  
Shares Exercisable | shares 10,898
Weighted- Average Exercise Price (in dollars per share) $ 12
$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 1,226
Weighted- Average Remaining Contractual Term 2 years 4 months 24 days
Weighted- Average Exercise Price (in dollars per share) $ 7
Options Exercisable  
Shares Exercisable | shares 1,226
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 16,634
Weighted- Average Remaining Contractual Term 4 years 3 months 18 days
Weighted- Average Exercise Price (in dollars per share) $ 14
Options Exercisable  
Shares Exercisable | shares 9,465
Weighted- Average Exercise Price (in dollars per share) $ 13
$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 207
Weighted- Average Remaining Contractual Term 1 year
Weighted- Average Exercise Price (in dollars per share) $ 23
Options Exercisable  
Shares Exercisable | shares 207
Weighted- Average Exercise Price (in dollars per share) $ 23