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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%