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Note 11 (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020	Jun. 30, 2021	Sep. 26, 2020
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total	$ 17,470,000		$ 17,470,000			$ 68,078,000
Proceeds from Sale and Maturity of Marketable Securities, Total	12,854,000	$ 23,187,000	54,191,000	$ 54,125,000
Marketable Securities, Gain (Loss), Total	21,000	324,000	139,000	1,746,000
Marketable Securities, Unrealized Gain (Loss), Total	137,000	$ 285,000	786,000	$ (1,708,000)
External Credit Rating, Investment Grade [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total	4,970,000		4,970,000		$ 12,500,000
Corporate Bond Securities [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total	$ 17,500,000		$ 17,500,000
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

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
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-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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