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Note 11 (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020	Sep. 26, 2020
Debt Securities, Held-to-maturity, Total	$ 28,959,000		$ 28,959,000		$ 68,078,000
Proceeds from Sale and Maturity of Marketable Securities, Total	15,189,000	$ 12,156,000	41,337,000	$ 30,938,000
Marketable Securities, Gain (Loss), Total	41,000	(2,059,000)	119,000	(2,070,000)
Marketable Securities, Unrealized Gain (Loss), Total	(46,000)	$ (2,064,000)	649,000	$ (1,993,000)
External Credit Rating, Investment Grade [Member]
Debt Securities, Held-to-maturity, Total	7,966,000		7,966,000
External Credit Rating, Non Investment Grade [Member]
Debt Securities, Held-to-maturity, Total	20,993,000		20,993,000
Corporate Bond Securities [Member]
Debt Securities, Held-to-maturity, Total	$ 29,000,000		$ 29,000,000
Investment Securities Maturity Term (Year)			2 years

X

- Definition

The maturity term of investment securities in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563

Reference 3: 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

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- Definition

Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

+ References

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- Definition

Amount of unrealized gain (loss) on investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

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