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Retirement Plan And Other Post-Retirement Benefits (Schedule Of Expected Benefit Payments) (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2019 - Benefit Payments $ 65,700
2020 - Benefit Payments 65,900
2021 - Benefit Payments 66,300
2022 - Benefit Payments 66,500
2023 - Benefit Payments 66,600
2024 through 2028 - Benefit Payments 330,900
Other Post-Retirement Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 - Benefit Payments 27,821
2019 - Subsidy Receipts (1,858)
2020 - Benefit Payments 28,692
2020 - Subsidy Receipts (1,996)
2021 - Benefit Payments 29,455
2021 - Subsidy Receipts (2,128)
2022 - Benefit Payments 29,979
2022 - Subsidy Receipts (2,260)
2023 - Benefit Payments 30,426
2023 - Subsidy Receipts (2,386)
2024 through 2028 - Benefit Payments 153,855
2024 through 2028 - Subsidy Receipts $ (13,325)