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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, 2018
Sep. 30, 2017
Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 116,943 $ 130,070  
Change in projected benefit obligation:      
Benefit obligation at beginning of year 134,480 142,574  
Service cost 1,332 2,756 $ 2,371
Interest cost 4,988 4,744 5,185
Actuarial (gain) loss (1,020) (2,452)  
Benefits paid (4,523) (4,588)  
Settlements (13,887) (8,554)  
Benefit obligation at end of year 121,370 134,480 142,574
Change in plan assets:      
Fair value of plan assets at beginning of year 0 0  
Employer contribution 18,410 13,142  
Benefits paid (4,523) (4,588)  
Settlements (13,887) (8,554)  
Fair value of plan assets at end of year 0 0 $ 0
Reconciliation:      
Funded status (121,370) (134,480)  
Unrecognized prior service cost 0 0  
Unrecognized net loss 0 0  
Net amount recognized $ (121,370) $ (134,480)