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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%