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Note 7 - Pension Plans (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 30, 2018
Defined Benefit Plan, Equity Securities [Member] | Buffalo Subsidiaries [Member] |  |  |
Defined Benefit Plan, Assets Excluded from Plan Assets, Actual Allocation, Percentage | 92.00% |  |
Defined Benefit Plan, Debt Security [Member] | Buffalo Subsidiaries [Member] |  |  |
Defined Benefit Plan, Assets Excluded from Plan Assets, Actual Allocation, Percentage | 2.00% |  |
Defined Benefit Plan, Cash and Cash Equivalents [Member] | Buffalo Subsidiaries [Member] |  |  |
Defined Benefit Plan, Assets Excluded from Plan Assets, Actual Allocation, Percentage | 6.00% |  |
Pension Plan [Member] |  |  |
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year | $ (4,018,000) |  |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | 401,381,000 | $ 192,369,000 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation | 401,381,000 |  |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets | $ 331,354,000 |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 6.00% | 5.50% | 5.50%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 3,190,000 |  |
Liability, Defined Benefit Plan, Noncurrent, Total | 70,027,000 | $ 45,370,000 |
Pension Plan [Member] | U.S. Small Cap Value Equity Common/Collective Fund [Member] |  |  |
Equity Securities, FV-NI | 5,500,000 | 9,524,000 |
Pension Plan [Member] | Global Equity Long/Short Common/Collective Hedge Fund-of-funds [Member] |  |  |
Equity Securities, FV-NI | 7,096,000 | 7,923,000 |
Pension Plan [Member] | Global Equity Long/Short Common/Collective Hedge Fund-of-funds 2 [Member] |  |  |
Equity Securities, FV-NI | 8,881,000 | 7,810,000 |
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase | 0 | 0 |
Other Pension Plan [Member] |  |  |
Liability, Defined Benefit Plan, Noncurrent, Total | $ 1,483,000 | $ 1,667,000 |

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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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- 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=118255775&loc=d3e1928-114920 + Details
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