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Retirement Plans (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan Expected Return on Plan Assets Major Asset Classes Time Horizon   2000.00%    
Defined Benefit Plan, Amortization of Gain (Loss)   $ (3.7) $ (1.7) $ (2.5)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   6.29% 5.79% 3.01%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   100.00%    
Discount rate   5.79% 3.01% 2.84%
Gain (loss) on corridor   10.00%    
Defined Contribution Plan, Cost   $ 8.2 $ 7.3 $ 5.9
Equity Securities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   30.00%    
Equity Securities [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   27.00%    
Equity Securities [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   33.00%    
Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Amortization of Gain (Loss) $ (4.6)