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Retirement Plan And Other Post-Retirement Benefits (Schedule Of Expected Benefit Payments) (Details) - Other Post-Retirement Benefit Plans [Member]
$ in Thousands
Sep. 30, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 - Benefit Payments $ 27,998
2020 - Subsidy Receipts (1,901)
2021 - Benefit Payments 28,711
2021 - Subsidy Receipts (2,025)
2022 - Benefit Payments 29,142
2022 - Subsidy Receipts (2,147)
2023 - Benefit Payments 29,478
2023 - Subsidy Receipts (2,264)
2024 - Benefit Payments 29,631
2024 - Subsidy Receipts (2,372)
2025 through 2029 - Benefit Payments 147,138
2025 through 2029 - Subsidy Receipts $ (12,960)