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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 6 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2013
Apr. 30, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost            
Interest cost 0.2 0.3 0.4 0.6
Amortization of prior service cost and recognized actuarial gain (0.4) (0.4) (0.8) (0.8)
Net periodic cost $ (0.2) $ (0.1) $ (0.4) $ (0.2)