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GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Feb. 11, 2019
Goodwill [Line Items]          
Goodwill acquired     $ 752.5    
Amortization of intangible assets $ 14.7 $ 3.9 18.4 $ 7.7  
Amortization expense, 2019 52.5   52.5    
Future amortization expense, 2020 66.5   66.5    
Future amortization expense, 2021 64.1   64.1    
Future amortization expense, 2022 56.8   56.8    
Future amortization expense, 2023 $ 54.1   54.1    
Paper Packaging & Services          
Goodwill [Line Items]          
Goodwill acquired     $ 752.5    
Caraustar          
Goodwill [Line Items]          
Intangibles         $ 717.1