Retirement Plans (Determining The Present Values Of Benefit Obligations And Net Periodic Benefit Costs) (Details)		12 Months Ended
		Sep. 27, 2015	Sep. 28, 2014	Sep. 29, 2013
Defined Benefit Plan Disclosure [Line Items]
Cash flow period extension		P30Y
Qualified Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumptions used to determine benefit obligations, Discount rate	[1]	4.79%	4.60%	5.37%
Assumptions used to determine benefit obligations, Rate of future pay increases	[1]	3.50%	3.50%	3.50%
Assumptions used to determine net periodic benefit cost, Discount rate	[2]	4.60%	5.37%	4.34%
Assumptions used to determine net periodic benefit cost, Long-term rate of return on assets	[2]	6.50%	7.25%	7.25%
Assumptions used to determine net periodic benefit cost, Rate of future pay increases	[2]	3.50%	3.50%	3.50%
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumptions used to determine benefit obligations, Discount rate	[1]	4.45%	4.36%	4.88%
Assumptions used to determine benefit obligations, Rate of future pay increases	[1]	3.50%	3.50%	3.50%
Assumptions used to determine net periodic benefit cost, Discount rate	[2]	4.36%	4.88%	4.34%
Assumptions used to determine net periodic benefit cost, Rate of future pay increases	[2]	3.50%	3.50%	3.50%
Postretirement Health Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumptions used to determine benefit obligations, Discount rate	[1]	4.47%	4.43%	5.04%
Assumptions used to determine net periodic benefit cost, Discount rate	[2]	4.43%	5.04%	4.34%

[1] Determined as of end of year

[2] Determined as of beginning of year.