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Note 7 - Pension Plans (Details Textual) - USD ($)
 12 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 30, 2018
Defined Benefit Plan, Equity Securities [Member] | Buffalo Subsidiaries [Member]      
Defined Benefit Plan, Assets Excluded from Plan Assets, Actual Allocation, Percentage 92.00%    
Defined Benefit Plan, Debt Security [Member] | Buffalo Subsidiaries [Member]      
Defined Benefit Plan, Assets Excluded from Plan Assets, Actual Allocation, Percentage 2.00%    
Defined Benefit Plan, Cash and Cash Equivalents [Member] | Buffalo Subsidiaries [Member]      
Defined Benefit Plan, Assets Excluded from Plan Assets, Actual Allocation, Percentage 6.00%    
Pension Plan [Member]      
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year $ (4,018,000)    
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation 401,381,000 $ 192,369,000  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation 401,381,000    
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets $ 331,354,000    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 6.00% 5.50% 5.50%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 3,190,000    
Liability, Defined Benefit Plan, Noncurrent, Total 70,027,000 $ 45,370,000  
Pension Plan [Member] | U.S. Small Cap Value Equity Common/Collective Fund [Member]      
Equity Securities, FV-NI 5,500,000 9,524,000  
Pension Plan [Member] | Global Equity Long/Short Common/Collective Hedge Fund-of-funds [Member]      
Equity Securities, FV-NI 7,096,000 7,923,000  
Pension Plan [Member] | Global Equity Long/Short Common/Collective Hedge Fund-of-funds 2 [Member]      
Equity Securities, FV-NI 8,881,000 7,810,000  
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase 0 0  
Other Pension Plan [Member]      
Liability, Defined Benefit Plan, Noncurrent, Total $ 1,483,000 $ 1,667,000