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Note 17 - Commitments and Contingent Liabilities (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 30, 2018
Restructuring Charges, Total | $ 13,751,000 | $ 11,635,000 | $ 5,550,000
Restructuring Reserve, Ending Balance | 0 | $ 0 |
Impact of Withdrawal from Retirement Plans [Member] |  |  |
Restructuring Charges, Total | 4,400,000 |  |
Employee Severance [Member] |  |  |
Restructuring Charges, Total | 6,272,000 |  |
Transition Costs Related to the Transactions [Member] |  |  |
Restructuring Charges, Total | 1,807,000 |  |
Other Restructuring [Member] |  |  |
Restructuring Charges, Total | $ 1,272,808 |  |
Minimum [Member] |  |  |
Multiemployer Plans, Withdrawal Obligation, Period (Year) | 20 years |  |
Plan Partially Withdrawn From in 2017 [Member] | Minimum [Member] |  |  |
Multiemployer Plans, Withdrawal Obligation, Period (Year) | 20 years |  |
Construction and Equipment Purchase Commitments [Member] |  |  |
Construction and Equipment, Purchase Commitments | $ 2,050,000 |  |

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