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Note A - Summary of Significant Accounting Policies - Calculation of EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 24, 2016
Jun. 25, 2016
Mar. 26, 2016
 [1]
Dec. 26, 2015
 [1]
Sep. 26, 2015
Jun. 27, 2015
Mar. 28, 2015
Dec. 27, 2014
 [1]
Sep. 24, 2016
Sep. 26, 2015
Sep. 27, 2014
Net Income available to common stockholders                 $ 75,975 $ 70,183 $ 71,814
Net Income available to common stockholders (in shares)                 18,649 18,685 18,677
Net Income available to common stockholders (in dollars per share)                 $ 4.07 $ 3.76 $ 3.85
Options (in shares)                 120 134 130
Options (in dollars per share)                 $ (0.02) $ (0.03) $ (0.03)
Net Income available to common stockholders plus assumed conversions                 $ 75,975 $ 70,183 $ 71,814
Net Income available to common stockholders plus assumed conversions (in shares)                 18,769 18,819 18,807
Net Income available to common stockholders plus assumed conversions (in dollars per share) $ 1.10 $ 1.43 $ 0.83 $ 0.69 $ 1.05 $ 1.30 $ 0.78 $ 0.60 $ 4.05 $ 3.73 $ 3.82
[1] Total of quarterly amounts do not necessarily agree to the annual report amounts due to separate quarterly calculations of weighted average shares outstanding.