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Note 8 - Pension Plans (Details Textual) - USD ($) | 12 Months Ended
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Sep. 26, 2021 | Sep. 27, 2020 | Sep. 29, 2019
Pension Plan [Member] |  |  |
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year | $ 5,035,000 |  |
Defined Benefit Plan, Accumulated Benefit Obligation | 384,187,000 | $ 401,381,000 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | 384,187,000 |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation | 384,187,000 |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | $ 176,214,000 |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 5.90% | 6.00% | 5.50%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 254,000 |  |
Liability, Defined Benefit Plan, Noncurrent, Total |  | $ 70,027,000 |
Pension Plan [Member] | U.S. Small Cap Value Equity Common/Collective Fund [Member] |  |  |
Equity Securities, FV-NI, Current | 7,236,000 | 5,500,000 |
Pension Plan [Member] | Global Equity Long/Short Common/Collective Hedge Fund-of-funds [Member] |  |  |
Equity Securities, FV-NI, Current | 8,371,000 | 7,096,000 |
Pension Plan [Member] | Global Equity Long/Short Common/Collective Hedge Fund-of-funds 2 [Member] |  |  |
Equity Securities, FV-NI, Current | 10,387,000 | 8,881,000 |
Other Pension Plan [Member] |  |  |
Liability, Defined Benefit Plan, Noncurrent, Total | $ 996,000 | $ 1,483,000 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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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=123447040&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=123447040&loc=d3e2919-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + 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 (g) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 + Details
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