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Note 11 (Details Textual)
 3 Months Ended
Dec. 24, 2016
USD ($)
Dec. 26, 2015
USD ($)
Sep. 24, 2016
USD ($)
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ 547,000   $ 602,000
Held-to-maturity Securities 112,042,000   104,271,000
Proceeds from Sale and Maturity of Marketable Securities 475,000 $ 1,198,000  
Marketable Securities, Gain (Loss) 0 $ (109,000)  
Four Mutual Funds [Member]      
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ 400,000    
Number of Funds 4    
Marketable Securities $ 12,600,000    
Mutual Funds [Member]      
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ 400,000   $ 520,000
Classification Of Noncurrent Asset, Mutual Funds, Period 1 year    
Corporate Bond Securities [Member]      
Held-to-maturity Securities $ 95,000,000    
Investment Securities Maturity Term 3 years