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Retirement and Post-Retirement Employee Benefit Plans - Plans’ Accumulated Benefit Obligation, Projected Benefit Obligation and Funded Status (Details) - Defined Benefit Plan - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 541,287 $ 478,750  
Change in projected benefit obligation:      
Benefit obligation at beginning of year 504,719 533,455  
Service cost 15,311 17,264 $ 18,109
Interest cost 22,071 20,803 20,443
Actuarial (gain) loss 71,139 (29,087)  
Benefits paid (35,970) (37,716)  
Benefit obligation at end of year 577,270 504,719 533,455
Change in plan assets:      
Fair value of plan assets at beginning of year 531,691 508,244  
Actual return on plan assets 25,888 54,163  
Employer contribution 8,500 7,000  
Benefits paid (35,970) (37,716)  
Fair value of plan assets at end of year 530,109 531,691 $ 508,244
Reconciliation:      
Funded status (47,161) 26,972  
Unrecognized prior service cost 0 0  
Unrecognized net loss 0 0  
Net amount recognized $ (47,161) $ 26,972