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Retirement and Post-Retirement Employee Benefit Plans - Supplemental Plans’ Accumulated Benefit Obligation, Projected Benefit Obligation and Funded Status (Details) - Supplemental Executive Retirement Plans - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 122,207 $ 138,772  
Change in projected benefit obligation:      
Benefit obligation at beginning of year 143,987 121,370  
Service cost 1,074 869 $ 1,332
Interest cost 4,188 5,127 4,988
Actuarial (gain) loss 7,386 25,099  
Benefits paid (4,766) (8,478)  
Settlements (22,729) 0  
Benefit obligation at end of year 129,140 143,987 121,370
Change in plan assets:      
Fair value of plan assets at beginning of year 0 0  
Employer contribution 27,495 8,478  
Benefits paid (4,766) (8,478)  
Settlements (22,729) 0  
Fair value of plan assets at end of year 0 0 $ 0
Reconciliation:      
Funded status (129,140) (143,987)  
Unrecognized prior service cost 0 0  
Unrecognized net loss 0 0  
Net amount recognized $ (129,140) $ (143,987)