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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
Jan. 31, 2013
Jan. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
   
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Service cost      
Interest cost 0.2 0.3
Amortization of prior service cost and recognized actuarial gain (0.4) (0.4)
Net periodic cost $ (0.2) $ (0.1)