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Restructuring Charges - Reconciliation of Beginning and Ended Restructuring Reserve Balances (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Restructuring Cost and Reserve [Line Items]          
Beginning balance     $ 4.1 $ 3.0  
Costs incurred and charged to expense $ 13.3 $ 5.6 40.0 16.1 $ 4.8
Costs paid or otherwise settled     (22.8) (15.0)  
Ending balance 21.3 4.1 21.3 4.1 3.0
Employee Separation Costs [Member]          
Restructuring Cost and Reserve [Line Items]          
Beginning balance     2.9 1.8  
Costs incurred and charged to expense     27.8 12.0 2.8
Costs paid or otherwise settled     (16.0) (10.9)  
Ending balance 14.7 2.9 14.7 2.9 1.8
Other Restructuring Costs [Member]          
Restructuring Cost and Reserve [Line Items]          
Beginning balance     1.2 1.2  
Costs incurred and charged to expense     12.2 4.1 2.0
Costs paid or otherwise settled     (6.8) (4.1)  
Ending balance $ 6.6 $ 1.2 $ 6.6 $ 1.2 $ 1.2