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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, 2016
$ / shares
shares
Options Outstanding  
Shares Outstanding | shares 28,218
Weighted- Average Remaining Contractual Term 5 years
Weighted- Average Exercise Price (in dollars per share) $ 12
Options Exercisable  
Shares Exercisable | shares 15,418
Weighted- Average Exercise Price (in dollars per share) $ 11
$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 4,970
Weighted- Average Remaining Contractual Term 3 years 9 months 18 days
Weighted- Average Exercise Price (in dollars per share) $ 7
Options Exercisable  
Shares Exercisable | shares 4,964
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 23,012
Weighted- Average Remaining Contractual Term 5 years 3 months 18 days
Weighted- Average Exercise Price (in dollars per share) $ 14
Options Exercisable  
Shares Exercisable | shares 10,218
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 236
Weighted- Average Remaining Contractual Term 1 year 10 months 24 days
Weighted- Average Exercise Price (in dollars per share) $ 23
Options Exercisable  
Shares Exercisable | shares 236
Weighted- Average Exercise Price (in dollars per share) $ 23