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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

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