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Note 7 - Postretirement and Postemployment Benefits - Fair Value Hierarchy of Benefit Plan Assets (Details) - Other Postretirement Benefits Plan [Member] - USD ($) $ in Thousands | Sep. 29, 2019 | Sep. 30, 2018
--- | --- | ---
Cash and cash equivalents |  |
Debt securities |  |
Hedge fund investments | 3,587 | 3,616
Domestic Equity Securities [Member] |  |
Equity Securities, FV-NI | 778 | 820
Foreign Equity Securities [Member] |  |
Equity Securities, FV-NI |  |
Fair Value, Inputs, Level 1 [Member] |  |
Cash and cash equivalents |  | 242
Debt securities | 17,707 | 19,185
Hedge fund investments |  |
Fair Value, Inputs, Level 1 [Member] | Domestic Equity Securities [Member] |  |
Equity Securities, FV-NI | 2,640 | 2,589
Fair Value, Inputs, Level 1 [Member] | Foreign Equity Securities [Member] |  |
Equity Securities, FV-NI | 628 | 681
Fair Value, Inputs, Level 2 [Member] |  |
Cash and cash equivalents |  |
Debt securities |  |
Hedge fund investments |  |
Fair Value, Inputs, Level 2 [Member] | Domestic Equity Securities [Member] |  |
Equity Securities, FV-NI |  |
Fair Value, Inputs, Level 2 [Member] | Foreign Equity Securities [Member] |  |
Equity Securities, FV-NI | 750 | 780
Fair Value, Inputs, Level 3 [Member] |  |
Cash and cash equivalents |  |
Debt securities |  |
Hedge fund investments |  |
Fair Value, Inputs, Level 3 [Member] | Domestic Equity Securities [Member] |  |
Equity Securities, FV-NI |  |
Fair Value, Inputs, Level 3 [Member] | Foreign Equity Securities [Member] |  |
Equity Securities, FV-NI |  |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Fair value of all derivative assets designated as fair value hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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