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Note 8 - Pension Plans - Allocation of Benefit Plan Assets (Details) - Pension Plan [Member] | Sep. 26, 2021 | Sep. 27, 2020
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Defined Benefit Plan, Equity Securities [Member] |  |
Asset Percentage, Policy Allocation | 50.00% |
Asset Percentage, Actual Allocation | 50.00% | 48.00%
Defined Benefit Plan, Equity Securities [Member] | Buffalo News [Member] |  |
Asset Percentage, Policy Allocation | 30.00% |
Asset Percentage, Actual Allocation | 31.00% | 92.00%
Defined Benefit Plan, Debt Security [Member] |  |
Asset Percentage, Policy Allocation | 35.00% |
Asset Percentage, Actual Allocation | 34.00% | 33.00%
Defined Benefit Plan, Debt Security [Member] | Buffalo News [Member] |  |
Asset Percentage, Policy Allocation | 70.00% |
Asset Percentage, Actual Allocation | 68.00% | 2.00%
US Treasury Securities [Member] |  |
Asset Percentage, Policy Allocation | 5.00% |
Asset Percentage, Actual Allocation | 4.00% | 5.00%
US Treasury Securities [Member] | Buffalo News [Member] |  |
Asset Percentage, Policy Allocation | 0.00% |
Asset Percentage, Actual Allocation | 0.00% | 0.00%
Hedge Funds [Member] |  |
Asset Percentage, Policy Allocation | 10.00% |
Asset Percentage, Actual Allocation | 11.00% | 10.00%
Hedge Funds [Member] | Buffalo News [Member] |  |
Asset Percentage, Policy Allocation | 0.00% |
Asset Percentage, Actual Allocation | 0.00% | 0.00%
Defined Benefit Plan, Cash and Cash Equivalents [Member] |  |
Asset Percentage, Policy Allocation | 0.00% |
Asset Percentage, Actual Allocation | 1.00% | 4.00%
Defined Benefit Plan, Cash and Cash Equivalents [Member] | Buffalo News [Member] |  |
Asset Percentage, Policy Allocation | 0.00% |
Asset Percentage, Actual Allocation | 1.00% | 6.00%

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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