Share-Based Compensation Plans - Assumption Used in Option Valuation Model (Details) - $ / shares
 12 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Expected life [1] 2 years 1 month 16 days 2 years 1 month 25 days 2 years 1 month 25 days
Expected stock price volatility [2] 19.00% 18.90% 19.00%
Risk free interest rate [3] 0.80% 0.80% 0.60%
Stock price (usd per share) [4] $ 38.65 $ 30.25 $ 26.57
[1] The expected life represents the remaining performance period of the awards.
[2] The expected volatility for each grant is determined based on the historical volatility of our common stock over a period equal to the remaining term of the performance period from the date of grant for all awards.
[3] The risk-free interest rate is based on the continuous compounded yield on U.S. Treasury Constant Maturity Rates with varying remaining terms; the yield is determined over a time period commensurate with the performance period from the grant date.
[4] The stock price is the closing price of our common stock on the valuation date.