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Note 6 - Pension Plans (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 30, 2018 | Sep. 24, 2017
Pension Plan [Member] |  |  |  |
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year |  | $ (3,166,000) |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  | 192,369,000 | $ 176,531,000 |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation |  | 192,369,000 |  |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation |  | 192,369,000 |  |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets |  | $ 146,999,000 |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets |  | 5.50% | 5.50% | 5.50%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year |  | $ 6,718,000 |  |
Liability, Defined Benefit Plan, Noncurrent, Total |  | 45,370,000 | $ 25,276,000 |
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year |  | (6,000) |  |
Pension Plan [Member] | U.S. Small Cap Value Equity Common/Collective Fund [Member] |  |  |  |
Equity Securities, FV-NI |  | 9,524,000 | 10,045,000 |
Pension Plan [Member] | Global Equity Long/Short Common/Collective Hedge Fund-of-funds 2 [Member] |  |  |  |
Equity Securities, FV-NI |  | 7,810,000 | 7,651,000 |
Pension Plan [Member] | Global Equity Long/Short Common/Collective Hedge Fund-of-funds [Member] |  |  |  |
Equity Securities, FV-NI |  | 7,923,000 | 8,116,000 |
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase |  | 0 | 0 |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Sale |  | 0 | 0 |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 |  | 0 | 0 |
Pension Plan [Member] | Forecast [Member] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 5.50% |  |  |
Other Pension Plan [Member] |  |  |  |
Liability, Defined Benefit Plan, Noncurrent, Total |  | $ 1,667,000 | $ 1,469,000 |

X
- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&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://fasb.org/us-gaap/role/ref/legacyRef -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 + 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/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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