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Postretirement Obligations (Details) - USD ($)
 12 Months Ended
Sep. 30, 2018
Sep. 24, 2017
Sep. 25, 2016
Defined Benefit Plan Disclosure [Line Items]      
Net Actuarial Gains/Losses, Amortization Next Twelve Months $ 976,000    
Postretirement assets, net 16,157,000 $ 15,392,000  
Prior Service Cost, Amortization Next Twelve Months 723,000    
LTD Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Funded (Unfunded) Status of Plan 2,580,000 $ 2,943,000  
Other Postretirement Benefit Plans, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 1,302,000    
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt, Next Twelve Months (108,000)    
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Next Twelve Months 1,194,000    
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components $ 18,000    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year 9.00% 9.70%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 3.00% 3.00% 4.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.00% 3.00%  
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax $ 12,224,000 $ 12,304,000  
Postretirement assets, net 12,891,000 11,020,000  
Liability, Defined Benefit Plan, Noncurrent 0 (2,061,000)  
Defined Benefit Plan, Benefit Obligation 11,756,000 15,667,000 $ 22,511,000
Defined Benefit Plan, Service Cost 0 13,000 0
Defined Benefit Plan, Interest Cost 365,000 412,000 1,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (1,080,000) (1,056,000) (1,000)
Post Retirement Plan, Amortization of Gain (Loss) 984,000 (987,000) (1,093)
Post Retirement Benefit Plan, Amortization of Prior Service Cost (Credit) (785,000) (1,459,000) (1,459)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (4,515,000) (6,818,000) (3,000)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (1,054,000) (627,000)  
Defined Benefit Plan, Plan Assets, Benefits Paid 1,399,000 1,527,000  
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment (1,924,000) (5,112,000)  
Defined Benefit Plan, Benefits Paid For Non-Participants (1,209,000) (834,000)  
Defined Benefit Plan, Prescription Drug Benefit, Net Periodic Postretirement Benefit Cost, (Increase) Decrease for Subsidy 101,000 (3,000)  
Defined Benefit Plan, Fair Value of Plan Assets 24,647,000 24,626,000 $ 24,123,000
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 2,106,000 2,112,000  
Defined Benefit Plan, Plan Assets, Contributions by Employer 422,000 755,000  
Defined Benefit Plan, Benefits Paid Net Of Subsidy (1,298,000) (1,530,000)  
Defined Benefit Plan, Funded (Unfunded) Status of Plan 12,891,000 8,959,000  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax 17,917,000 18,782,000  
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost, before Tax 5,693,000 6,478,000  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax $ 17,917,000 $ 18,782,000  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Expected Long-term Return on Assets 4.50% 4.50%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 5.00% 5.00% 5.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 4.50% 4.50%  
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate 2026 2026  
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components $ (17,000)    
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation 456,000    
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation (417,000)    
Defined Benefit Plan, Expected Future Benefit Payment, Year Two 1,276,000    
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt, Year Two (107,000)    
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 2 1,169,000    
Defined Benefit Plan, Expected Future Benefit Payment, Year Three 1,241,000    
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt, Year Three (106,000)    
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 3 1,135,000    
Defined Benefit Plan, Expected Future Benefit Payment, Year Four 1,198,000    
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt, Year Four (103,000)    
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 4 1,095,000    
Defined Benefit Plan, Expected Future Benefit Payment, Year Five 1,147,000    
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt, Year Five (99,000)    
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 5 1,048,000    
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter 4,794,000    
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt, after Year Five (408,000)    
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, After Year 5 $ 4,386,000    
Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 2000.00%    
Defined Benefit Plan, Actual Plan Asset Allocations 0.00% 0.00%  
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 7000.00%    
Defined Benefit Plan, Actual Plan Asset Allocations 100.00% 100.00%  
Other Postretirement Benefit Plans, Defined Benefit [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 0.00%    
Defined Benefit Plan, Actual Plan Asset Allocations 0.00% 0.00%  
Other Postretirement Benefit Plans, Defined Benefit [Member] | Hedge Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 1000.00%    
Defined Benefit Plan, Actual Plan Asset Allocations 0.00% 0.00%