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Employee Retirement Plans - Pension Plans Assets (Details) - U.S. - Pension Benefits
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans    
Actual 100.00% 100.00%
Target Asset Allocation 100.00% 100.00%
Permitted target allocation range 5.00%  
Equity investments    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Actual 52.40% 61.40%
Target Asset Allocation 53.20% 61.60%
Fixed income funds & cash equivalents    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Actual 44.90% 35.50%
Target Asset Allocation 43.40% 35.00%
Alternative investments    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Actual 2.70% 3.10%
Target Asset Allocation 3.40% 3.40%