Net Income Per Common Share - Additional Information (Detail) - shares shares in Millions |
6 Months Ended | |
|---|---|---|
Apr. 30, 2016 |
Apr. 30, 2015 |
|
| Earnings Per Share [Abstract] | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 2.6 | 1.3 |