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Note 7 - Postretirement and Postemployment Benefits - Allocation of Benefit Plan Assets (Details) - Other Postretirement Benefits Plan [Member] | Sep. 29, 2019 | Sep. 30, 2018
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Defined Benefit Plan, Equity Securities [Member] |  |
Asset Percentage, Policy Allocation | 20.00% |
Asset Percentage, Actual Allocation | 18.00% | 18.00%
Defined Benefit Plan, Debt Security [Member] |  |
Asset Percentage, Policy Allocation | 70.00% |
Asset Percentage, Actual Allocation | 68.00% | 69.00%
Hedge Funds [Member] |  |
Asset Percentage, Policy Allocation | 10.00% |
Asset Percentage, Actual Allocation | 14.00% | 13.00%
Defined Benefit Plan, Cash and Cash Equivalents [Member] |  |
Asset Percentage, Policy Allocation |  |
Asset Percentage, Actual Allocation |  |

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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=118257860&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=118255775&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=118255775&loc=d3e1928-114920 + Details
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