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RESTRUCTURING CHARGES - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2021 | Apr. 30, 2020
Restructuring and Related Costs [Line Items] |  |  |  |
Restructuring charges | $ 12.0 | $ 4.4 | $ 15.1 | $ 7.7
Amounts remaining to be incurred | 19.4 |  | 19.4 |
Employee Separation Costs |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Restructuring charges | 9.1 |  | 10.6 |
Other restructuring costs |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Restructuring charges | $ 2.9 |  | $ 4.5 |

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