Note 7 - Pension Plans - Fair Value Hierarchy of Benefit Plan Assets (Details) - USD ($) $ in Thousands	Sep. 27, 2020	Sep. 29, 2019
Fair Value Measured at Net Asset Value Per Share [Member]
Hedge fund investments	$ 15,977
Fair Value, Inputs, Level 1 [Member]
Hedge fund investments	0
Fair Value, Inputs, Level 2 [Member]
Hedge fund investments	0
Fair Value, Inputs, Level 3 [Member]
Hedge fund investments	0
Pension Plan [Member] \| Fair Value Measured at Net Asset Value Per Share [Member]
Cash and cash equivalents	0	$ 0
Debt securities	0	0
Hedge fund investments		15,733
Pension Plan [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Domestic Equity Securities [Member]
Equity Securities, FV-NI	5,500	9,524
Pension Plan [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Foreign Equity Securities [Member]
Equity Securities, FV-NI	0	0
Pension Plan [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Emerging Equity Securities [Member]
Equity Securities, FV-NI	0
Pension Plan [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| US Treasury Securities [Member]
Equity Securities, FV-NI	0	0
Pension Plan [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	17,287	2,970
Debt securities	22,253	26,392
Hedge fund investments		0
Pension Plan [Member] \| Fair Value, Inputs, Level 1 [Member] \| Domestic Equity Securities [Member]
Equity Securities, FV-NI	151,584	8,971
Pension Plan [Member] \| Fair Value, Inputs, Level 1 [Member] \| Foreign Equity Securities [Member]
Equity Securities, FV-NI	6,893	6,525
Pension Plan [Member] \| Fair Value, Inputs, Level 1 [Member] \| Emerging Equity Securities [Member]
Equity Securities, FV-NI	7,225
Pension Plan [Member] \| Fair Value, Inputs, Level 1 [Member] \| US Treasury Securities [Member]
Equity Securities, FV-NI	6,967	6,918
Pension Plan [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Debt securities	32,167	24,190
Hedge fund investments		0
Pension Plan [Member] \| Fair Value, Inputs, Level 2 [Member] \| Domestic Equity Securities [Member]
Equity Securities, FV-NI	60,333	40,593
Pension Plan [Member] \| Fair Value, Inputs, Level 2 [Member] \| Foreign Equity Securities [Member]
Equity Securities, FV-NI	7,396	7,283
Pension Plan [Member] \| Fair Value, Inputs, Level 2 [Member] \| Emerging Equity Securities [Member]
Equity Securities, FV-NI	0
Pension Plan [Member] \| Fair Value, Inputs, Level 2 [Member] \| US Treasury Securities [Member]
Equity Securities, FV-NI	0	0
Pension Plan [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Debt securities	0	0
Hedge fund investments		0
Pension Plan [Member] \| Fair Value, Inputs, Level 3 [Member] \| Domestic Equity Securities [Member]
Equity Securities, FV-NI	0	0
Pension Plan [Member] \| Fair Value, Inputs, Level 3 [Member] \| Foreign Equity Securities [Member]
Equity Securities, FV-NI	0	0
Pension Plan [Member] \| Fair Value, Inputs, Level 3 [Member] \| Emerging Equity Securities [Member]
Equity Securities, FV-NI	0
Pension Plan [Member] \| Fair Value, Inputs, Level 3 [Member] \| US Treasury Securities [Member]
Equity Securities, FV-NI	$ 0	$ 0

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.

No definition available.

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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

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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=121590274&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=121645371&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563

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