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POST RETIREMENT BENEFIT PLANS - Additional Information (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 USD ($) plan | Jan. 31, 2020 | Apr. 30, 2020 USD ($) plan | Apr. 30, 2019 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Company's pension contributions |  |  | $ 18.0 | $ 11.8
United States | Pension Plans, Defined Benefit |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Employer contributions during period |  |  | 44.3 |
Decrease for settlement |  |  | 44.3 |
Gain on settlement |  |  | $ 0.1 |
Number of plans | plan | 2 |  | 2 |
Obligation period decrease | $ 19.0 |  |  |
Plan assets, decrease | $ 9.3 |  |  |
Defined benefit plan, assumptions used, discount rate |  | 3.38% |  |

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