Retirement Plans and Postretirement Health Care and Life Insurance Benefits - Components of Net Periodic Cost for Postretirement Benefits (Detail) (Other Postretirement Benefit Plans, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost
Interest cost	0.2	0.2	0.6	0.6
Amortization of prior service cost and recognized actuarial gain	(0.4)	(0.4)	(1.2)	(1.2)
Net periodic benefit for postretirement benefits	$ (0.2)	$ (0.2)	$ (0.6)	$ (0.6)