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Retirement and Post-Retirement Employee Benefit Plans - Schedule of Employee Pension Plans Investments at Fair Value (Details) - Defined Benefit Plan - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 530,109 $ 531,691 $ 508,244
Investments net of receivable      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 528,798 529,673  
Investments measured at FV      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 355,105 356,883  
Common stocks      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 212,785 197,577  
Money market funds      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 16,419 19,153  
Registered investment companies      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 26,326 50,895  
Mortgage-backed securities      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 19,986 18,821  
U.S. treasuries      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 23,815 23,939  
Corporate bonds      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 55,774 46,498  
Common/collective trusts      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 108,975 108,391  
Limited partnerships      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 64,718 64,399  
Level 1      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 262,041 271,543  
Level 1 | Common stocks      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 212,785 197,577  
Level 1 | Money market funds      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 1 | Registered investment companies      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 26,326 50,895  
Level 1 | Mortgage-backed securities      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 1 | U.S. treasuries      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 22,930 23,071  
Level 1 | Corporate bonds      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 2      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 93,064 85,340  
Level 2 | Common stocks      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 2 | Money market funds      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 16,419 19,153  
Level 2 | Registered investment companies      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 2 | Mortgage-backed securities      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 19,986 18,821  
Level 2 | U.S. treasuries      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 885 868  
Level 2 | Corporate bonds      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 55,774 46,498  
Level 3      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 3 | Common stocks      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 3 | Money market funds      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 3 | Registered investment companies      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 3 | Mortgage-backed securities      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 3 | U.S. treasuries      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0 0  
Level 3 | Corporate bonds      
Derivatives, Fair Value [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 0 $ 0