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Note L - Stock Options - Incentive Stock Options by Exercise Price Range (Details) - Incentive Stock Options [Member] - $ / shares	12 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Options outstanding (in shares)	470,420	434,152	433,556	392,981
Options outstanding, weighted-average exercise price (in dollars per share)	$ 136.62	$ 136.53	$ 120.90	$ 109.41
Exercisable options (in shares)	138,600
Exercisable Options, weighted average exercise price (in dollars per share)	$ 121.73
Exercise Price Range 1 [Member]
Range of exercise price, lower limit (in dollars per share)	108.69
Range of exercise price, upper limit (in dollars per share)	$ 158.97
Options outstanding (in shares)	362,734
Options oustanding, weighted-average remaining contractual life (Year)	2 years 8 months 12 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 128.64
Exercisable options (in shares)	138,600
Exercisable Options, weighted average exercise price (in dollars per share)	$ 121.73
Exercise Price Range 2 [Member]
Range of exercise price, lower limit (in dollars per share)	163.29
Range of exercise price, upper limit (in dollars per share)	$ 192.13
Options outstanding (in shares)	107,686
Options oustanding, weighted-average remaining contractual life (Year)	3 years 7 months 6 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 163.47
Exercisable options (in shares)	0
Exercisable Options, weighted average exercise price (in dollars per share)	$ 0

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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- Definition

Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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