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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, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2021 - Benefit Payments $ 28,361
2021 - Subsidy Receipts (1,950)
2022 - Benefit Payments 28,820
2022 - Subsidy Receipts (2,064)
2023 - Benefit Payments 29,085
2023 - Subsidy Receipts (2,172)
2024 - Benefit Payments 29,192
2024 - Subsidy Receipts (2,273)
2025 - Benefit Payments 29,231
2025 - Subsidy Receipts (2,356)
2026 through 2030 - Benefit Payments 143,696
2026 through 2030 - Subsidy Receipts $ (12,763)