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Retirement Plans (Health Care Cost Trend Rates For Postretirement Health Plans) (Details)	12 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Oct. 03, 2010
Participants Under Age 65 [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate for next year	8.50%	7.70%	7.75%
Rate to which the cost trend rate is assumed to decline	4.50%	5.10%	4.50%
Year the rate reaches the ultimate trend rate	2029	2040	2028
Participants Age 65 Or Older [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate for next year	8.00%	7.00%	7.25%
Rate to which the cost trend rate is assumed to decline	4.50%	4.50%	4.50%
Year the rate reaches the ultimate trend rate	2027	2028	2028

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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