Retirement Plans (Reconciliation Of The Changes In Benefit Obligations, Plan Assets And Funded Status Of Retirement Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Sep. 28, 2014
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Actuarial gains (losses) arising during the period	$ 71,971	$ 54,407	$ 49,173
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	67,425	44,544	43,928
Qualified Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at beginning of year	442,264	434,896
Service cost	4,479	7,592	7,633
Interest cost	20,926	19,750	20,196
Participant contributions	0	0
Actuarial loss	75,456	16,757
Benefits paid	(9,791)	(10,261)
Settlements	(10,875)	(26,470)
Other	0	0
Obligation at end of year	522,459	442,264	434,896
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of year	332,657	356,312
Actual return on plan assets	31,411	(6,924)
Participant contributions	0	0
Employer contributions	95,000	20,000
Defined Benefit Plan, Benefits Paid	9,791	10,261
Settlements	(10,875)	(26,470)
Defined Benefit Plan, Other	0	0
Fair value at end of year	438,402	332,657	356,312
Funded status at end of year	(84,057)	(109,607)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current liabilities	0	0
Noncurrent liabilities	(84,057)	(109,607)
Total liability recognized	(84,057)	(109,607)
Unamortized actuarial loss, net	216,129	153,156
Unamortized prior service cost	0	0
Total	216,129	153,156
Actuarial gains (losses) arising during the period	65,801	46,952
Amortization of actuarial loss	(2,828)	(8,278)
Amortization of prior service cost	0	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	62,973	38,674
Net periodic benefit cost and other losses	6,477	12,347	6,912
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	69,450	51,021
Net actuarial loss	4,455
Prior service cost	0
Total	4,455
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at beginning of year	75,346	69,733
Service cost	773	676	490
Interest cost	3,253	2,945	3,049
Participant contributions	0	0
Actuarial loss	6,938	6,447
Benefits paid	(4,860)	(4,455)
Settlements	0	0
Other	0	0
Obligation at end of year	81,450	75,346	69,733
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	4,860	4,455
Defined Benefit Plan, Benefits Paid	4,860	4,455
Settlements	0	0
Defined Benefit Plan, Other	0	0
Fair value at end of year	0	0	0
Funded status at end of year	(81,450)	(75,346)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current liabilities	(4,504)	(4,477)
Noncurrent liabilities	(76,946)	(70,869)
Total liability recognized	(81,450)	(75,346)
Unamortized actuarial loss, net	37,417	31,738
Unamortized prior service cost	571	811
Total	37,988	32,549
Actuarial gains (losses) arising during the period	6,938	6,447
Amortization of actuarial loss	(1,259)	(1,134)
Amortization of prior service cost	(240)	(269)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	5,439	5,044
Net periodic benefit cost and other losses	5,525	5,024	4,667
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	10,964	10,068
Net actuarial loss	1,658
Prior service cost	153
Total	1,811
Postretirement Health Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at beginning of year	28,911	27,626
Service cost	0	0
Interest cost	1,263	1,196	1,639
Participant contributions	127	114
Actuarial loss	(768)	1,008
Benefits paid	(1,161)	(1,184)
Settlements	0	0
Other	(158)	151
Obligation at end of year	28,214	28,911	27,626
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	127	114
Employer contributions	1,192	919
Defined Benefit Plan, Benefits Paid	1,161	1,184
Settlements	0	0
Defined Benefit Plan, Other	(158)	151
Fair value at end of year	0	0	0
Funded status at end of year	(28,214)	(28,911)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current liabilities	(1,325)	(1,294)
Noncurrent liabilities	(26,889)	(27,617)
Total liability recognized	(28,214)	(28,911)
Unamortized actuarial loss, net	2,239	3,226
Unamortized prior service cost	0	0
Total	2,239	3,226
Actuarial gains (losses) arising during the period	(768)	1,008
Amortization of actuarial loss	(219)	(182)
Amortization of prior service cost	0	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	(987)	826
Net periodic benefit cost and other losses	1,482	1,378	$ 2,181
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	495	$ 2,204
Net actuarial loss	161
Prior service cost	0
Total	$ 161