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RETIREMENT PLANS - Plan Asset Allocations and Expected Future Benefit Payments (Details) - Defined Benefit Pension Plan - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2019
--- | --- | --- | --- | ---
International Plan |  |  |  |
Plan asset allocations: |  |  |  |
Expected company contributions in fiscal 2023 |  | $ 1.1 |  |
Expected future benefit payments: |  |  |  |
2023 |  | 5.6 |  |
2024 |  | 5.8 |  |
2025 |  | 6.1 |  |
2026 |  | 6.2 |  |
2027 |  | 6.2 |  |
2028 – 2032 |  | $ 33.8 |  |
International Plan | Equity securities |  |  |  |
Plan asset allocations: |  |  |  |
Plan asset allocations |  | 25.00% | 22.00% |
International Plan | Equity securities | Scenario, Forecast |  |  |  |
Plan asset allocations: |  |  |  |
Plan asset allocations | 25.00% |  |  |
International Plan | Debt securities |  |  |  |
Plan asset allocations: |  |  |  |
Plan asset allocations |  | 44.00% | 48.00% |
International Plan | Debt securities | Scenario, Forecast |  |  |  |
Plan asset allocations: |  |  |  |
Plan asset allocations | 44.00% |  |  |
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 |  | 1.00% | 0.00% |
International Plan | Cash and cash equivalents | Scenario, Forecast |  |  |  |
Plan asset allocations: |  |  |  |
Plan asset allocations | 1.00% |  |  |
International Plan | Insurance contracts |  |  |  |
Plan asset allocations: |  |  |  |
Plan asset allocations |  | 30.00% |  | 30.00%
International Plan | Insurance contracts | Scenario, Forecast |  |  |  |
Plan asset allocations: |  |  |  |
Plan asset allocations | 30.00% |  |  |
U.S. Plan |  |  |  |
Plan asset allocations: |  |  |  |
Expected company contributions in fiscal 2023 |  | $ 0.2 |  |
Expected future benefit payments: |  |  |  |
2023 |  | 7.4 |  |
2024 |  | 7.2 |  |
2025 |  | 7.0 |  |
2026 |  | 6.9 |  |
2027 |  | 6.8 |  |
2028 – 2032 |  | $ 30.5 |  |
U.S. Plan | Equity securities |  |  |  |
Plan asset allocations: |  |  |  |
Plan asset allocations |  | 17.00% | 20.00% |
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% | 73.00% |
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 |  | 5.00% | 4.00% |
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 |  | 3.00% | 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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