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RETIREMENT PLANS - Plan Asset Allocations and Expected Future Benefit Payments (Details) - Defined Benefit Pension Plan - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | --- | ---
International Plan |  |  |
Plan asset allocations: |  |  |
Expected company contributions in fiscal 2024 |  | $ 1.8 |
Expected future benefit payments: |  |  |
2024 |  | 6.4 |
2025 |  | 6.7 |
2026 |  | 6.8 |
2027 |  | 6.8 |
2028 |  | 7.0 |
2029 – 2033 |  | $ 37.0 |
International Plan | Equity securities |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 0.00% | 25.00%
International Plan | Equity securities | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 0.00% |  |
International Plan | Debt securities |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 5.00% | 44.00%
International Plan | Debt securities | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 5.00% |  |
International Plan | Real estate securities |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 0.00% | 0.00%
International Plan | Real estate securities | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 0.00% |  |
International Plan | Cash and cash equivalents |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 11.00% | 1.00%
International Plan | Cash and cash equivalents | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 11.00% |  |
International Plan | Insurance contracts |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 84.00% | 30.00%
International Plan | Insurance contracts | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 84.00% |  |
U.S. Plan |  |  |
Plan asset allocations: |  |  |
Expected company contributions in fiscal 2024 |  | $ 2.9 |
Expected future benefit payments: |  |  |
2024 |  | 7.4 |
2025 |  | 7.1 |
2026 |  | 7.0 |
2027 |  | 6.8 |
2028 |  | 6.6 |
2029 – 2033 |  | $ 29.4 |
U.S. Plan | Equity securities |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 18.00% | 17.00%
U.S. Plan | Equity securities | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 22.00% |  |
U.S. Plan | Debt securities |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 75.00% | 75.00%
U.S. Plan | Debt securities | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 74.00% |  |
U.S. Plan | Real estate securities |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 3.00% | 5.00%
U.S. Plan | Real estate securities | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 4.00% |  |
U.S. Plan | Cash and cash equivalents |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 4.00% | 3.00%
U.S. Plan | Cash and cash equivalents | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 0.00% |  |
U.S. Plan | Insurance contracts |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 0.00% | 0.00%
U.S. Plan | Insurance contracts | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 0.00% |  |

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