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Restructuring Charges - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Apr. 30, 2014
Apr. 30, 2014
Apr. 30, 2013
Restructuring Cost and Reserve [Line Items]      
Beginning balance   $ 3.0  
Costs incurred and charged to expense 3.9 6.5 1.2
Costs paid or otherwise settled   (3.5)  
Ending balance 6.0 6.0  
Employee Separation Costs [Member]
      
Restructuring Cost and Reserve [Line Items]      
Beginning balance   1.8  
Costs incurred and charged to expense 2.7 5.1  
Costs paid or otherwise settled   (2.2)  
Ending balance 4.7 4.7  
Other Restructuring Costs [Member]
      
Restructuring Cost and Reserve [Line Items]      
Beginning balance   1.2  
Costs incurred and charged to expense   1.2  
Costs paid or otherwise settled   (1.1)  
Ending balance 1.3 1.3  
Asset Impairments [Member]
      
Restructuring Cost and Reserve [Line Items]      
Beginning balance       
Costs incurred and charged to expense   0.2  
Costs paid or otherwise settled   (0.2)  
Ending balance