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Retirement and Post-Retirement Employee Benefit Plans - Schedule of Expected Benefit Payments Post Retirement Benefit Plan (Details) - Postretirement Plans
$ in Thousands
Sep. 30, 2019
USD ($)
Company Payments  
2020 $ 18,797
2021 14,161
2022 14,408
2023 15,277
2024 16,078
2025-2029 89,998
Retiree Payments  
2020 3,901
2021 4,150
2022 4,470
2023 4,939
2024 5,369
2025-2029 32,135
Subsidy Payments  
2020 0
2021 0
2022 0
2023 0
2024 0
2025-2029 0
Total Postretirement Benefits  
2020 22,698
2021 18,311
2022 18,878
2023 20,216
2024 21,447
2025-2029 $ 122,133