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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. 01, 2017
Oct. 02, 2016
Sep. 27, 2015
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Actuarial gains (losses) arising during the period $ (49,025) $ 71,971 $ 54,407
Total recognized in OCI 55,454 (67,425) (44,544)
Qualified Pension Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Obligation at beginning of year 522,459 442,264  
Service cost 1,331 4,479 7,592
Interest cost 19,889 20,926 19,750
Participant contributions 0 0  
Actuarial (gain) loss (20,081) 75,456  
Benefits paid (10,425) (9,791)  
Settlements (19,406) (10,875)  
Other 0 0  
Obligation at end of year 493,767 522,459 442,264
Defined Benefit Plan, Funded Status of Plan (33,058) (84,057)  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value at beginning of year 438,402 332,657  
Actual return on plan assets 52,138 31,411  
Participant contributions 0 0  
Employer contributions 0 95,000  
Defined Benefit Plan, Benefits Paid (10,425) (9,791)  
Settlements (19,406) (10,875)  
Defined Benefit Plan, Other 0 0  
Fair value at end of year 460,709 438,402 332,657
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Current liabilities 0 0  
Noncurrent liabilities (33,058) (84,057)  
Total liability recognized (33,058) (84,057)  
Unamortized actuarial loss, net 167,598 216,129  
Unamortized prior service cost 0 0  
Total 167,598 216,129  
Actuarial gains (losses) arising during the period 44,077 (65,801)  
Amortization of actuarial loss (4,455) (2,828)  
Amortization of prior service cost 0 0  
Total recognized in OCI 48,532 (62,973)  
Net periodic benefit cost and other losses (2,467) 6,477 12,347
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (50,999) 69,450  
Net actuarial loss (3,330)    
Prior service cost 0    
Total 3,330    
Supplemental Employee Retirement Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Obligation at beginning of year 81,450 75,346  
Service cost 855 773 676
Interest cost 2,850 3,253 2,945
Participant contributions 0 0  
Actuarial (gain) loss (2,296) 6,938  
Benefits paid (4,458) (4,860)  
Settlements 0 0  
Other 0 0  
Obligation at end of year 78,401 81,450 75,346
Defined Benefit Plan, Funded Status of Plan (78,401) (81,450)  
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 4,458 4,860  
Defined Benefit Plan, Benefits Paid (4,458) (4,860)  
Settlements 0 0  
Defined Benefit Plan, Other 0 0  
Fair value at end of year 0 0 0
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Current liabilities (4,448) (4,504)  
Noncurrent liabilities (73,953) (76,946)  
Total liability recognized (78,401) (81,450)  
Unamortized actuarial loss, net 33,462 37,417  
Unamortized prior service cost 418 571  
Total 33,880 37,988  
Actuarial gains (losses) arising during the period 2,296 (6,938)  
Amortization of actuarial loss (1,659) (1,259)  
Amortization of prior service cost 153 240  
Total recognized in OCI 4,108 (5,439)  
Net periodic benefit cost and other losses 5,517 5,525 5,024
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income 1,409 10,964  
Net actuarial loss (1,538)    
Prior service cost 146    
Total 1,684    
Postretirement Health Plans [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Obligation at beginning of year 28,214 28,911  
Service cost 0 0  
Interest cost 1,003 1,263 1,196
Participant contributions 118 127  
Actuarial (gain) loss (2,652) (768)  
Benefits paid (1,168) (1,161)  
Settlements 0 0  
Other 145 (158)  
Obligation at end of year 25,660 28,214 28,911
Defined Benefit Plan, Funded Status of Plan (25,660) (28,214)  
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 118 127  
Employer contributions 905 1,192  
Defined Benefit Plan, Benefits Paid (1,168) (1,161)  
Settlements 0 0  
Defined Benefit Plan, Other 145 (158)  
Fair value at end of year 0 0 0
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Current liabilities (1,308) (1,325)  
Noncurrent liabilities (24,352) (26,889)  
Total liability recognized (25,660) (28,214)  
Unamortized actuarial loss, net (574) 2,239  
Unamortized prior service cost 0 0  
Total (574) 2,239  
Actuarial gains (losses) arising during the period 2,652 768  
Amortization of actuarial loss (162) (219)  
Amortization of prior service cost 0 0  
Total recognized in OCI 2,814 987  
Net periodic benefit cost and other losses 1,165 1,482 $ 1,378
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (1,649) $ 495  
Net actuarial loss 27    
Prior service cost 0    
Total $ (27)