Retirement Plan And Other Post-Retirement Benefits (Schedule Of Expected Benefit Payments) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
2013 - Benefit Payments	$ 55,900
2014 - Benefit Payments	56,500
2015 - Benefit Payments	57,300
2016 - Benefit Payments	58,500
2017 - Benefit Payments	59,600
2018 through 2022 - Benefit Payments	315,200
Other Post-Retirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2013 - Benefit Payments	26,559
2013 - Subsidy Receipts	(1,828)
2014 - Benefit Payments	27,852
2014 - Subsidy Receipts	(2,021)
2015 - Benefit Payments	29,154
2015 - Subsidy Receipts	(2,220)
2016 - Benefit Payments	30,506
2016 - Subsidy Receipts	(2,420)
2017 - Benefit Payments	31,859
2017 - Subsidy Receipts	(2,606)
2018 through 2022 - Benefit Payments	175,145
2018 through 2022 - Subsidy Receipts	$ (15,964)