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Note 11 (Details)
3 Months Ended
Dec. 26, 2015
USD ($)
Dec. 27, 2014
USD ($)
Sep. 26, 2015
USD ($)
Note 11 (Details) [Line Items]      
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ 1,715,000   $ 990,000
Held-to-maturity Securities 87,772,000   66,660,000
Proceeds from Sale and Maturity of Marketable Securities 1,198,000 $ 11,601,000  
Marketable Securities, Gain (Loss) (109,000) $ (509,000)  
Four Mutual Funds [Member]      
Note 11 (Details) [Line Items]      
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ 1,300,000    
Number of Funds 4    
Marketable Securities $ 17,500,000    
Mutual Funds [Member]      
Note 11 (Details) [Line Items]      
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax     $ 827,000
Classification of Noncurrent Asset, Mutual Funds, Period 1 year    
Corporate Bond Securities [Member]      
Note 11 (Details) [Line Items]      
Held-to-maturity Securities $ 65,000,000    
Investment Securities, Maturity Term 3 years