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Note 6 - Pension, Postretirement and Postemployment Defined Benefit Plans (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Dec. 27, 2020
Jun. 27, 2021
Defined Benefit Plan, Plan Assets, Contributions by Employer   $ 965,000
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year   $ 0
Multiemployer Plans, Withdrawal Obligation $ 12,310,000  
Multiemployer Plans, Withdrawal Obligation, Period (Year) 20 years  
Postemployment Retirement Benefits [Member]    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment $ 23,830,000  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment $ 23,830,000