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Restructuring Charges - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Restructuring Cost and Reserve [Line Items]          
Begining balance     $ 19.6 $ 20.3  
Costs incurred and charged to expense 10.5 19.1 33.4 30.5 26.7
Costs paid or otherwise settled     (45.0) (31.2)  
Ending balance 8.0 19.6 8.0 19.6 20.3
Employee separation costs [Member]
          
Restructuring Cost and Reserve [Line Items]          
Begining balance     11.8 12.7  
Costs incurred and charged to expense     13.4 13.3 13.7
Costs paid or otherwise settled     (19.0) (14.2)  
Ending balance 6.2 11.8 6.2 11.8 12.7
Other Restructuring Costs [Member]
          
Restructuring Cost and Reserve [Line Items]          
Begining balance     7.6 7.6  
Costs incurred and charged to expense     9.8 12.7 7.7
Costs paid or otherwise settled     (15.6) (12.7)  
Ending balance 1.8 7.6 1.8 7.6 7.6
Asset Impairments [Member]
          
Restructuring Cost and Reserve [Line Items]          
Begining balance     0.2     
Costs incurred and charged to expense     10.2 4.5  
Costs paid or otherwise settled     (10.4) (4.3)  
Ending balance    0.2    0.2  
Inventory write-down [Member]
          
Restructuring Cost and Reserve [Line Items]          
Begining balance            
Costs incurred and charged to expense            
Costs paid or otherwise settled            
Ending balance