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RESTRUCTURING CHARGES - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Restructuring Reserve [Roll Forward]        
Beginning balance     $ 5.2  
Costs incurred and charged to expense $ 3.7 $ 3.9 13.8 $ 8.7
Costs paid or otherwise settled     (14.0)  
Ending balance 5.0   5.0  
Employee Separation Costs        
Restructuring Reserve [Roll Forward]        
Beginning balance     3.9  
Costs incurred and charged to expense 3.1   11.4  
Costs paid or otherwise settled     (10.9)  
Ending balance 4.4   4.4  
Other Costs        
Restructuring Reserve [Roll Forward]        
Beginning balance     1.3  
Costs incurred and charged to expense 0.6   2.4  
Costs paid or otherwise settled     (3.1)  
Ending balance $ 0.6   $ 0.6