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Note L - Stock Options - Nonqualified Stock Options by Excercise Price Range (Details) - Non-qualified Stock Options [Member] - $ / shares	12 Months Ended
	Sep. 30, 2017	Sep. 24, 2016	Sep. 26, 2015	Sep. 27, 2014
Options outstanding (in shares)	311,514	311,884	297,941	249,379
Options outstanding, weighted-average remaining contractual life (Year)	4 years 255 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 92.58	$ 75.56	$ 63.34	$ 53.38
Options exercisable (in shares)	137,856
Options exercisable, weighted-average exercise price (in dollars per share)	$ 62.21
Exercise Price Range 1 [Member]
Range of exercise price, lower limit (in dollars per share)	34.17
Range of exercise price, upper limit (in dollars per share)	$ 47.59
Options outstanding (in shares)	60,000
Options outstanding, weighted-average remaining contractual life (Year)	2 years 255 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 41.17
Options exercisable (in shares)	60,000
Options exercisable, weighted-average exercise price (in dollars per share)	$ 41.17
Exercise Price Range 2 [Member]
Range of exercise price, lower limit (in dollars per share)	57.33
Range of exercise price, upper limit (in dollars per share)	$ 81.67
Options outstanding (in shares)	57,856
Options outstanding, weighted-average remaining contractual life (Year)	4 years 36 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 72.95
Options exercisable (in shares)	57,856
Options exercisable, weighted-average exercise price (in dollars per share)	$ 72.95
Exercise Price Range 3 [Member]
Range of exercise price, lower limit (in dollars per share)	94.24
Range of exercise price, upper limit (in dollars per share)	$ 131.30
Options outstanding (in shares)	193,658
Options outstanding, weighted-average remaining contractual life (Year)	5 years 182 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 114.38
Options exercisable (in shares)	20,000
Options exercisable, weighted-average exercise price (in dollars per share)	$ 94.24

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://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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