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Retirement and Post-Retirement Employee Benefit Plans - Postretirement Plans’ Accumulated Benefit Obligation, Projected Benefit Obligation and Funded Status (Details) - Postretirement Plans - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Change in projected benefit obligation:      
Benefit obligation at beginning of year $ 265,986 $ 274,098  
Service cost 10,810 12,078 $ 12,436
Interest cost 11,839 10,907 10,679
Plan participants’ contributions 5,901 4,720  
Actuarial (gain) loss 39,472 (17,252)  
Benefits paid (17,975) (18,565)  
Benefit obligation at end of year 316,033 265,986 274,098
Change in plan assets:      
Fair value of plan assets at beginning of year 199,361 184,790  
Actual return on plan assets 1,125 10,997  
Employer contribution 13,489 17,419  
Plan participants’ contributions 5,901 4,720  
Benefits paid (17,975) (18,565)  
Fair value of plan assets at end of year 201,901 199,361 $ 184,790
Reconciliation:      
Funded status (114,132) (66,625)  
Unrecognized prior service cost 0 0  
Unrecognized prior service cost 0 0  
Unrecognized net loss 0 0  
Net amount recognized $ (114,132) $ (66,625)