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Earnings Per Share (Schedule of Stock Options to Purchase Common Stock Not Included in Diluted Net Income Per Share Calculation) (Details) - $ / shares
shares in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Stock Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Numbers of stock option shares excluded 198 199 322 1,145
Range of exercise prices, lower limit $ 254.77 $ 229.66 $ 226.3 $ 15.83
Range of exercise prices, upper limit $ 254.77 $ 229.66 $ 254.77 $ 229.66
Restricted Stock Units (RSUs)        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Numbers of stock option shares excluded 25 81 26 575