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Retirement Plans (Reconciliation of Changes in Benefit Obligations, Plan Assets and Funded Status of Retirement Plans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Oct. 01, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value at beginning of year $ 456,127    
Fair value at end of year 476,194 $ 456,127  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Net actuarial loss (gain) 62,377 (31,478) $ (49,025)
Total recognized in OCI 58,460 (36,466) (55,454)
Supplemental Employee Retirement Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Obligation at beginning of year 73,067 78,401  
Service cost 0 490 855
Interest cost 3,080 2,894 2,850
Participant contributions 0 0  
Actuarial loss (gain) 8,771 (4,686)  
Benefits paid (5,025) (4,032)  
Settlements 0 0  
Other 0 0  
Obligation at end of year 79,893 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  
Participant contributions 0 0  
Employer contributions 5,025 4,032  
Benefits paid (5,025) (4,032)  
Settlements 0 0  
Other 0 0  
Fair value at end of year 0 0 0
Funded status at end of year (79,893) (73,067)  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Current liabilities (5,371) (5,037)  
Noncurrent liabilities (74,522) (68,030)  
Total liability recognized (79,893) (73,067)  
Unamortized actuarial loss (gain), net 34,803 27,239  
Unamortized prior service cost 157 271  
Total 34,960 27,510  
Net actuarial loss (gain) 8,771 (4,686)  
Amortization of actuarial (loss) gain (1,207) (1,538)  
Amortization of prior service cost (115) (146)  
Total recognized in OCI 7,449 (6,370)  
Net periodic benefit (credit) cost and other losses 4,402 5,068 5,517
Total recognized in comprehensive income 11,851 (1,302)  
Net actuarial loss 1,652    
Prior service cost 84    
Total 1,736    
Postretirement Health Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Obligation at beginning of year 23,461 25,660  
Service cost 0 0  
Interest cost 997 955 1,003
Participant contributions 112 115  
Actuarial loss (gain) 2,343 (1,720)  
Benefits paid (1,354) (1,563)  
Settlements 0 0  
Other 73 14  
Obligation at end of year 25,632 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  
Participant contributions 112 115  
Employer contributions 1,169 1,435  
Benefits paid (1,354) (1,563)  
Settlements 0 0  
Other 73 13  
Fair value at end of year 0 0 0
Funded status at end of year (25,632) (23,461)  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Current liabilities (1,379) (1,353)  
Noncurrent liabilities (24,253) (22,108)  
Total liability recognized (25,632) (23,461)  
Unamortized actuarial loss (gain), net 235 (2,267)  
Unamortized prior service cost 0 0  
Total 235 (2,267)  
Net actuarial loss (gain) 2,343 (1,720)  
Amortization of actuarial (loss) gain 159 27  
Amortization of prior service cost 0 0  
Total recognized in OCI 2,502 (1,693)  
Net periodic benefit (credit) cost and other losses 838 928 1,165
Total recognized in comprehensive income 3,340 (765)  
Net actuarial loss 17    
Prior service cost 0    
Total 17    
Qualified Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Obligation at beginning of year 457,109 493,767  
Service cost 0 1,743  
Interest cost 19,825 19,463 19,889
Participant contributions 0 0  
Actuarial loss (gain) 61,029 (37,872)  
Benefits paid (12,224) (10,949)  
Settlements (3,808) (9,043)  
Other 0 0  
Obligation at end of year 521,931 457,109 493,767
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value at beginning of year 456,127 460,709  
Actual return on plan assets 36,099 15,410  
Participant contributions 0 0  
Employer contributions 0 0  
Benefits paid (12,224) (10,949)  
Settlements (3,808) (9,043)  
Other 0 0  
Fair value at end of year 476,194 456,127 460,709
Funded status at end of year (45,737) (982)  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Current liabilities 0 0  
Noncurrent liabilities (45,737) (982)  
Total liability recognized (45,737) (982)  
Unamortized actuarial loss (gain), net 187,705 139,195  
Unamortized prior service cost 0 0  
Total 187,705 139,195  
Net actuarial loss (gain) 51,263 (25,072)  
Amortization of actuarial (loss) gain (2,754) (3,331)  
Amortization of prior service cost 0 0  
Total recognized in OCI 48,509 (28,403)  
Net periodic benefit (credit) cost and other losses (3,755) (3,673) $ (2,467)
Total recognized in comprehensive income 44,754 $ (32,076)  
Net actuarial loss 4,125    
Prior service cost 0    
Total $ 4,125