Note 11 (Details Textual)	3 Months Ended		9 Months Ended
	Jun. 25, 2016 USD ($)	Jun. 27, 2015 USD ($)	Jun. 25, 2016 USD ($)	Jun. 27, 2015 USD ($)	Sep. 26, 2015 USD ($)
Four Mutual Funds [Member]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	$ 884,000		$ 884,000
Number of Funds			4
Marketable Securities	13,100,000		$ 13,100,000
Preferred Stock [Member]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	479,000		479,000		$ 163,000
Marketable Securities	14,800,000		$ 14,800,000
Number of Holdings			12
Mutual Funds [Member]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	884,000		$ 884,000		827,000
Classification Of Noncurrent Asset, Mutual Funds, Period			1 year
Corporate Bond Securities [Member]
Held-to-maturity Securities	85,000,000		$ 85,000,000
Investment Securities Maturity Term			3 years
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	1,363,000		$ 1,363,000		990,000
Held-to-maturity Securities	105,864,000		105,864,000		$ 66,660,000
Proceeds from Sale and Maturity of Marketable Securities	5,624,000	$ 26,367,000	11,008,000	$ 39,968,000
Marketable Securities, Gain (Loss)	$ (176,000)	$ (1,395,000)	$ (582,000)	$ (1,904,000)