Retirement Plan (Weighted Average Assumptions Used To Determine Benefit Obligation And Benefit Cost) (Details)	12 Months Ended
	Oct. 01, 2016	Sep. 26, 2015
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate for benefit obligation	2.70%	4.00%
Discount rate for net benefit cost	3.50%	4.00%
Expected return on plan assets for net benefit costs	5.30%	7.30%
Retiree Health Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate for benefit obligation	2.90%	3.00%
Discount rate for net benefit cost	3.50%	2.90%