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Note 9 - Postretirement and Postemployment Benefits (Details Textual) - USD ($)
 12 Months Ended
Sep. 26, 2021
Sep. 27, 2020
Sep. 29, 2019
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year $ 995,000    
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year $ 647,000    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 4.00% 4.50% 4.50%
Assets for Plan Benefits, Defined Benefit Plan $ 17,664,000 $ 15,241,000  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 0    
Defined Benefit Plan, Benefit Obligation, Ending Balance 18,538,000 47,637,000 $ 11,752,000
Other Postretirement Benefits Plan [Member] | U.S. Small Cap Value Equity Common/Collective Fund [Member]      
Equity Securities, FV-NI, Current 904,000 590,000  
Other Postretirement Benefits Plan [Member] | Global Equity Long/Short Common/Collective Hedge Fund-of-funds [Member]      
Equity Securities, FV-NI, Current 3,235,000 2,754,000  
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 0 0  
Postemployment Retirement Benefits [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 23,830,000 (0) $ (0)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 23,830,000    
Defined Benefit Plan, Benefit Obligation, Ending Balance 2,233,000 2,371,000  
Master Trust Assets for the Retiree Medical Plan [Member]      
Assets for Plan Benefits, Defined Benefit Plan $ 631,000 $ 671,000