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RESTRUCTURING CHARGES - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Detail) - USD ($)
$ in Millions
 3 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Restructuring Reserve [Roll Forward]    
Beginning balance $ 4.4  
Costs incurred and charged to expense 3.7 $ 4.1
Costs paid or otherwise settled (4.6)  
Ending balance 3.5  
Employee Separation Costs    
Restructuring Reserve [Roll Forward]    
Beginning balance 4.2  
Costs incurred and charged to expense 3.5  
Costs paid or otherwise settled (4.4)  
Ending balance 3.3  
Other Costs    
Restructuring Reserve [Roll Forward]    
Beginning balance 0.2  
Costs incurred and charged to expense 0.2  
Costs paid or otherwise settled (0.2)  
Ending balance $ 0.2