Share-Based Compensation Plans - Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Oct. 31, 2016 |
Oct. 31, 2015 |
Oct. 31, 2014 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Weighted average fair value of granted purchase rights per share (usd per share) | $ 1.63 | $ 1.51 | $ 1.36 |
| Common stock issued | 0.2 | 0.2 | 0.2 |
| Fair value of common stock issued per share (usd per share) | $ 30.94 | $ 28.77 | $ 25.78 |
| Aggregate purchases | $ 4.7 | $ 4.7 | $ 4.3 |