Retirement Plans (Health Care Cost Trend Rates For Postretirement Health Plans) (Details)	12 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Sep. 28, 2014
Participants Under Age 65 [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate for next year	7.75%	8.00%	8.25%
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	2030	2030	2030
Participants Age 65 Or Older [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate for next year	7.25%	7.50%	7.75%
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	2028	2028	2028