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Note 8 - Postretirement and Postemployment Benefits (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 27, 2020 | Sep. 27, 2020 | Sep. 29, 2019 | Sep. 30, 2018
Postretirement Health Coverage [Member] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment |  |  | $ 2,031,000 |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment |  |  |  | $ (7,036,000)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax |  |  | (106,000) |
Assets for Plan Benefits, Defined Benefit Plan |  | $ 15,912,000 | $ 14,338,000 |
Postretirement Health Coverage [Member] | Forecast [Member] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment | $ 23,800,000 |  |  |
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year |  | 687,000 |  |
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 |  | 4.50% | 4.50% | 4.50%
Assets for Plan Benefits, Defined Benefit Plan |  | $ 15,241,000 | $ 12,383,000 |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year |  | 0 |  |
Defined Benefit Plan, Benefit Obligation, Ending Balance |  | 47,637,000 | 11,752,000 | $ 11,756,000
Other Postretirement Benefits Plan [Member] | U.S. Small Cap Value Equity Common/Collective Fund [Member] |  |  |  |
Equity Securities, FV-NI |  | 590,000 | 778,000 |
Other Postretirement Benefits Plan [Member] | Global Equity Long/Short Common/Collective Hedge Fund-of-funds [Member] |  |  |  |
Equity Securities, FV-NI |  | 2,754,000 | 3,587,000 |
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 |
Master Trust Assets for the Retiree Medical Plan [Member] |  |  |  |
Assets for Plan Benefits, Defined Benefit Plan |  | 671,000 | 1,955,000 |
Postemployment Retirement Benefits [Member] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment |  | (0) | (0) | $ 2,031,000
Defined Benefit Plan, Benefit Obligation, Ending Balance |  | $ 2,371,000 | $ 2,550,000 |

X
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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