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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
Sep. 30, 2018
Oct. 01, 2017
Oct. 02, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value at beginning of year $ 460,709    
Fair value at end of year 456,127 $ 460,709  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Actuarial gains (losses) arising during the period (31,478) (49,025) $ (71,971)
Total recognized in OCI (36,466) (55,454) 67,425
Supplemental Employee Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 0 0  
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 0 0  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Obligation at beginning of year 78,401 81,450  
Service cost 490 855 773
Interest cost 2,894 2,850 3,253
Actuarial gain (4,686) (2,296)  
Benefits paid (4,032) (4,458)  
Settlements 0 0  
Other 0 0  
Obligation at end of year 73,067 78,401 81,450
Defined Benefit Plan, Funded (Unfunded) Status of Plan (73,067) (78,401)  
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  
Employer contributions 4,032 4,458  
Benefits paid (4,032) (4,458)  
Settlements 0 0  
Defined Benefit Plan, Other 0 0  
Fair value at end of year 0 0 0
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Current liabilities (5,037) (4,448)  
Noncurrent liabilities (68,030) (73,953)  
Total liability recognized (73,067) (78,401)  
Unamortized actuarial loss, net 27,239 33,462  
Unamortized prior service cost (271) (418)  
Total 27,510 33,880  
Actuarial gains (losses) arising during the period 4,686 2,296  
Amortization of actuarial loss (gain) (1,538) (1,659)  
Amortization of prior service cost (146) (153)  
Total recognized in OCI (6,370) (4,108)  
Net periodic benefit cost and other losses 5,068 5,517 5,525
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (1,302) 1,409  
Net actuarial loss (1,207)    
Prior service cost 115    
Total 1,322    
Postretirement Health Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 115 118  
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 115 118  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Obligation at beginning of year 25,660 28,214  
Service cost 0 0  
Interest cost 955 1,003 1,263
Actuarial gain (1,720) (2,652)  
Benefits paid (1,563) (1,168)  
Settlements 0 0  
Other 14 145  
Obligation at end of year 23,461 25,660 28,214
Defined Benefit Plan, Funded (Unfunded) Status of Plan (23,461) (25,660)  
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  
Employer contributions 1,435 905  
Benefits paid (1,563) (1,168)  
Settlements 0 0  
Defined Benefit Plan, Other 13 145  
Fair value at end of year 0 0 0
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Current liabilities (1,352) (1,308)  
Noncurrent liabilities (22,108) (24,352)  
Total liability recognized (23,460) (25,660)  
Unamortized actuarial loss, net (2,267) (574)  
Unamortized prior service cost 0 0  
Total (2,267) (574)  
Actuarial gains (losses) arising during the period 1,720 2,652  
Amortization of actuarial loss (gain) 27 (162)  
Amortization of prior service cost 0 0  
Total recognized in OCI (1,693) (2,814)  
Net periodic benefit cost and other losses 928 1,165 1,482
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (765) (1,649)  
Net actuarial loss 159    
Prior service cost 0    
Total (159)    
Qualified Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 0 0  
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 0 0  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Obligation at beginning of year 493,767 522,459  
Service cost 1,743 1,331 4,479
Interest cost 19,463 19,889 20,926
Actuarial gain (37,872) (20,081)  
Benefits paid (10,949) (10,425)  
Settlements (9,043) (19,406)  
Other 0 0  
Obligation at end of year 457,109 493,767 522,459
Defined Benefit Plan, Funded (Unfunded) Status of Plan (982) (33,058)  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value at beginning of year 460,709 438,402  
Actual return on plan assets 15,410 52,138  
Employer contributions 0 0  
Benefits paid (10,949) (10,425)  
Settlements (9,043) (19,406)  
Defined Benefit Plan, Other 0 0  
Fair value at end of year 456,127 460,709 438,402
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Current liabilities 0 0  
Noncurrent liabilities (982) (33,058)  
Total liability recognized (982) (33,058)  
Unamortized actuarial loss, net 139,195 167,598  
Unamortized prior service cost 0 0  
Total 139,195 167,598  
Actuarial gains (losses) arising during the period 25,072 44,077  
Amortization of actuarial loss (gain) (3,331) (4,455)  
Amortization of prior service cost 0 0  
Total recognized in OCI (28,403) (48,532)  
Net periodic benefit cost and other losses (3,673) (2,467) $ 6,477
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (32,076) $ (50,999)  
Net actuarial loss (2,754)    
Prior service cost 0    
Total $ 2,754