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Retirement Plan And Other Post-Retirement Benefits (Schedule Of Expected Benefit Payments) (Details)
$ in Thousands
Sep. 30, 2015
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2016 - Benefit Payments $ 61,100
2017 - Benefit Payments 62,100
2018 - Benefit Payments 63,000
2019 - Benefit Payments 63,700
2020 - Benefit Payments 64,400
2021 through 2025 - Benefit Payments 332,100
Other Post-Retirement Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2016 - Benefit Payments 25,728
2016 - Subsidy Receipts (1,786)
2017 - Benefit Payments 26,942
2017 - Subsidy Receipts (1,935)
2018 - Benefit Payments 28,059
2018 - Subsidy Receipts (2,094)
2019 - Benefit Payments 29,038
2019 - Subsidy Receipts (2,259)
2020 - Benefit Payments 30,079
2020 - Subsidy Receipts (2,405)
2021 through 2025 - Benefit Payments 161,958
2021 through 2025 - Subsidy Receipts $ (14,197)