Retirement Plans (Reconciliation Of The Changes In Benefit Obligations, Plan Assets And Funded Status Of Retirement Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 29, 2013
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of year	$ 356,312
Fair value at end of year	332,657	$ 356,312
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Actuarial gains (losses) arising during the period	54,407	49,173	$ (98,764)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	44,544	43,928	(117,659)
Qualified Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at beginning of year	434,896	382,068
Service cost	7,592	7,633	10,210
Interest cost	19,750	20,196	19,964
Participant contributions	0	0
Actuarial loss	16,757	59,661
Benefits paid	(10,261)	(10,963)
Defined Benefit Plan, Settlements, Benefit Obligation	(26,470)	(23,699)
Defined Benefit Plan, Settlements, Plan Assets	(26,470)	(23,699)
Other	0	0
Obligation at end of year	442,264	434,896	382,068
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of year	356,312	336,425
Actual return on plan assets	(6,924)	34,549
Participant contributions	0	0
Employer contributions	20,000	20,000
Fair value at end of year	332,657	356,312	336,425
Funded status at end of year	(109,607)	(78,584)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current liabilities	0	0
Noncurrent liabilities	(109,607)	(78,584)
Total liability recognized	(109,607)	(78,584)
Unamortized actuarial loss, net	153,156	114,482
Unamortized prior service cost	0	0
Total	153,156	114,482
Actuarial gains (losses) arising during the period	46,952	49,603
Amortization of actuarial loss	(8,278)	(3,575)
Amortization of prior service cost	0	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	38,674	46,028
Net periodic benefit cost and other losses	12,347	6,912	23,124
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	51,021	52,940
Net actuarial loss	2,828
Prior service cost	0
Total	2,828
Defined Benefit Plan, Other	0
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at beginning of year	69,733	64,717
Service cost	676	490	543
Interest cost	2,945	3,049	2,664
Participant contributions	0	0
Actuarial loss	6,447	5,652
Benefits paid	(4,455)	(4,175)
Defined Benefit Plan, Settlements, Benefit Obligation	0	0
Defined Benefit Plan, Settlements, Plan Assets	0	0
Other	0	0
Obligation at end of year	75,346	69,733	64,717
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of year	0	0
Actual return on plan assets	0	0
Participant contributions	0	0
Employer contributions	4,455	4,175
Fair value at end of year	0	0	0
Funded status at end of year	(75,346)	(69,733)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current liabilities	(4,477)	(4,479)
Noncurrent liabilities	(70,869)	(65,254)
Total liability recognized	(75,346)	(69,733)
Unamortized actuarial loss, net	31,738	26,425
Unamortized prior service cost	811	1,080
Total	32,549	27,505
Actuarial gains (losses) arising during the period	6,447	5,652
Amortization of actuarial loss	(1,134)	(859)
Amortization of prior service cost	(269)	(269)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	5,044	4,524
Net periodic benefit cost and other losses	5,024	4,667	5,646
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	10,068	9,191
Net actuarial loss	1,259
Prior service cost	240
Total	1,499
Defined Benefit Plan, Other	0
Postretirement Health Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at beginning of year	27,626	33,243
Service cost	0	0
Interest cost	1,196	1,639	1,586
Participant contributions	114	123
Actuarial loss	1,008	(6,082)
Benefits paid	(1,184)	(1,456)
Defined Benefit Plan, Settlements, Benefit Obligation	0	0
Defined Benefit Plan, Settlements, Plan Assets	0	0
Other	151	159
Obligation at end of year	28,911	27,626	33,243
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of year	0	0
Actual return on plan assets	0	0
Participant contributions	114	123
Employer contributions	919	1,174
Fair value at end of year	0	0	0
Funded status at end of year	(28,911)	(27,626)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current liabilities	(1,294)	(1,269)
Noncurrent liabilities	(27,617)	(26,357)
Total liability recognized	(28,911)	(27,626)
Unamortized actuarial loss, net	3,226	2,400
Unamortized prior service cost	0	0
Total	3,226	2,400
Actuarial gains (losses) arising during the period	1,008	(6,082)
Amortization of actuarial loss	(182)	(542)
Amortization of prior service cost	0	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	826	(6,624)
Net periodic benefit cost and other losses	1,378	2,181	$ 2,377
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	2,204	(4,443)
Net actuarial loss	218
Prior service cost	0
Total	218
Defined Benefit Plan, Other	$ 151	$ 159