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RETIREMENT PLANS - Plan Asset Allocations and Expected Future Benefit Payments (Details) - Defined Benefit Pension Plan - USD ($) $ in Millions | Sep. 30, 2026 | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | --- | ---
International Plan |  |  |
Plan asset allocations: |  |  |
Expected company contributions in fiscal 2026 |  | $ 1.0 |
Expected future benefit payments: |  |  |
2026 |  | 7.6 |
2027 |  | 7.6 |
2028 |  | 7.7 |
2029 |  | 8.0 |
2030 |  | 8.2 |
2031 – 2035 |  | $ 41.1 |
International Plan | Equity securities |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 0.00% | 0.00%
International Plan | Equity securities | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 0.00% |  |
International Plan | Debt securities |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 0.00% | 0.00%
International Plan | Debt securities | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 0.00% |  |
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 |  | 15.00% | 15.00%
International Plan | Cash and cash equivalents | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 15.00% |  |
International Plan | Insurance contracts |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 85.00% | 85.00%
International Plan | Insurance contracts | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 85.00% |  |
U.S. Plan |  |  |
Plan asset allocations: |  |  |
Expected company contributions in fiscal 2026 |  | $ 2.6 |
Expected future benefit payments: |  |  |
2026 |  | 7.3 |
2027 |  | 6.8 |
2028 |  | 6.6 |
2029 |  | 6.4 |
2030 |  | 6.2 |
2031 – 2035 |  | $ 27.0 |
U.S. Plan | Equity securities |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 17.00% | 19.00%
U.S. Plan | Equity securities | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 17.00% |  |
U.S. Plan | Debt securities |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 69.00% | 74.00%
U.S. Plan | Debt securities | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 78.00% |  |
U.S. Plan | Real estate securities |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 3.00% | 2.00%
U.S. Plan | Real estate securities | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 3.00% |  |
U.S. Plan | Cash and cash equivalents |  |  |
Plan asset allocations: |  |  |
Plan asset allocations |  | 11.00% | 5.00%
U.S. Plan | Cash and cash equivalents | Scenario, Forecast |  |  |
Plan asset allocations: |  |  |
Plan asset allocations | 2.00% |  |
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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