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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, 2021
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2022 - Benefit Payments $ 27,230
2022 - Subsidy Receipts (1,900)
2023 - Benefit Payments 27,442
2023 - Subsidy Receipts (2,006)
2024 - Benefit Payments 27,601
2024 - Subsidy Receipts (2,111)
2025 - Benefit Payments 27,691
2025 - Subsidy Receipts (2,201)
2026 - Benefit Payments 27,643
2026 - Subsidy Receipts (2,289)
2027 through 2031 - Benefit Payments 134,674
2027 through 2031 - Subsidy Receipts $ (12,253)