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Retirement Plans (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Amortization of Gain (Loss)   $ (1.7) $ (2.5) $ (2.8)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate   5.79% 3.01% 2.84%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage   100.00%    
Discount rate   3.01% 2.84% 3.26%
Defined Contribution Plan, Cost   $ 7.3 $ 5.9 $ 5.3
Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan Expected Return on Plan Assets Major Asset Classes Time Horizon   1000.00%    
Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan Expected Return on Plan Assets Major Asset Classes Time Horizon   1500.00%    
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   25.00%    
Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Amortization of Gain (Loss) $ (3.7)