Net Income Per Common Share - Calculations of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Schedule of Earnings Per Share, Basic and Diluted, by Common Class
Income from continuing operations	$ 13.6	$ 14.3
Income from discontinued operations, net of income tax benefit	0.4	3.4
Net income	$ 14.0	$ 17.7
Weighted-average common and common equivalent shares outstanding-Basic (in shares)	56.6	56.4
Effect of dilutive securities:
Weighted-average common and common equivalent shares outstanding-Diluted (in shares)	57.1	57.2
Net income per common share — Basic:
Income from continuing operations (in dollars per share)	$ 0.24	$ 0.25
Income from discontinued operations (in dollars per share)	0.01	0.06
Net income (in dollars per share)	0.25	0.31
Net income per common share — Diluted:
Income from continuing operations (in dollars per share)	0.24	0.25
Income from discontinued operations (in dollars per share)	0.00	0.06
Net income (in dollars per share)	$ 0.24	$ 0.31
Restricted stock units
Effect of dilutive securities:
Effect of dilutive securities (in shares)	0.2	0.3
Stock options
Effect of dilutive securities:
Effect of dilutive securities (in shares)	0.2	0.3
Performance shares
Effect of dilutive securities:
Effect of dilutive securities (in shares)	0.1	0.2