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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

X

- 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.

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X

- 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

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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

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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

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