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RETIREMENT PLANS - Fair Value of The Company's Pension Plan Asset (Details) - Defined Benefit Pension Plan - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | --- | ---
International Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 141.4 | $ 124.8 | $ 128.9
International Plan | Fair Value, Inputs, Level 1 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 141.4 | 118.3 |
International Plan | Fair value, inputs, level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 21.9 | 14.0 |
International Plan | Fair value, inputs, level 3 | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 119.5 | 104.3 |
International Plan | Total common collective trusts measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 6.5 |
International Plan | Total common collective trusts measured at net asset value | Common collective trusts—real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
International Plan | Total common collective trusts measured at net asset value | Common collective trusts—equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
International Plan | Total common collective trusts measured at net asset value | Common collective trusts—fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 6.5 |
U.S. Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 57.3 | 54.1 | $ 59.1
U.S. Plan | Fair Value, Inputs, Level 1 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2.6 | 2.2 |
U.S. Plan | Fair value, inputs, level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2.6 | 2.2 |
U.S. Plan | Fair value, inputs, level 3 | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
U.S. Plan | Total common collective trusts measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 54.7 | 51.9 |
U.S. Plan | Total common collective trusts measured at net asset value | Common collective trusts—real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1.4 | 1.8 |
U.S. Plan | Total common collective trusts measured at net asset value | Common collective trusts—equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 10.9 | 10.0 |
U.S. Plan | Total common collective trusts measured at net asset value | Common collective trusts—fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 42.4 | $ 40.1 |

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