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Note A - Summary of Significant Accounting Policies (Details) - Calculation of EPS - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 26, 2015
 [1]
Jun. 27, 2015
 [1]
Mar. 28, 2015
 [1]
Dec. 27, 2014
 [1]
Sep. 27, 2014
 [1]
Jun. 28, 2014
 [1]
Mar. 29, 2014
 [1]
Dec. 28, 2013
 [1]
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Earnings Per Basic Share                      
Income (Numerator)                 $ 70,183 $ 71,814 $ 64,381
Shares (Denominator)                 18,685 18,677 18,785
Per Share Amount                 $ 3.76 $ 3.85 $ 3.43
Effect of Dilutive Securities                      
Options                 134 130 93
Options                 $ (0.03) $ (0.03) $ (0.02)
Earnings Per Diluted Share                      
Income (Numerator)                 $ 70,183 $ 71,814 $ 64,381
Shares (Denominator)                 18,819 18,807 18,878
Per Share Amount $ 1.05 $ 1.30 $ 0.78 $ 0.60 $ 1.18 $ 1.26 $ 0.72 $ 0.66 $ 3.73 [1] $ 3.82 [1] $ 3.41
[1] Total of quarterly amounts do not necessarily agree to the annual report amounts due to separate quarterly calculations of weighted average shares outstanding.