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Note C - Investment Securities (Details)	12 Months Ended
	Sep. 26, 2015 USD ($)	Sep. 27, 2014 USD ($)	Sep. 28, 2013 USD ($)
Note C - Investment Securities (Details) [Line Items]
Available-for-sale Securities	$ 39,638,000	$ 128,117,000
Held-to-maturity Securities	66,660,000	2,000,000
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	63,522,000	0
Proceeds from Sale and Maturity of Marketable Securities	110,117,000	7,245,000	$ 25,307,000
Marketable Securities, Gain (Loss)	(4,319,000)	(361,000)	$ (108,000)
Mutual Funds [Member]
Note C - Investment Securities (Details) [Line Items]
Available-for-sale Securities	19,214,000	128,117,000
Available-for-sale Securities, Gross Realized Losses	$ 4,300,000
Classification of Noncurrent Asset, Mutual Funds, Period	1 year
Four Mutual Funds [Member]
Note C - Investment Securities (Details) [Line Items]
Unrealized Gain (Loss) on Securities	$ 827,000
Number of Funds	4
Marketable Securities	$ 19,200,000
Corporate Bond Securities [Member]
Note C - Investment Securities (Details) [Line Items]
Held-to-maturity Securities	$ 67,000,000
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount		$ 40,000,000

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