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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. 30, 2017
 [1]
Jun. 24, 2017
 [1]
Mar. 25, 2017
 [1]
Dec. 24, 2016
 [1]
Sep. 24, 2016
 [1]
Jun. 25, 2016
 [1]
Mar. 26, 2016
 [1]
Dec. 26, 2015
 [1]
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Net Income available to common stockholders                 $ 79,174 $ 75,975 $ 70,183
Net Income available to common stockholders (in shares)                 18,707 18,649 18,685
Net Income available to common stockholders (in dollars per share)                 $ 4.23 $ 4.07 $ 3.76
Options (in shares)                 109 120 134
Options (in dollars per share)                 $ (0.02) $ (0.02) $ (0.03)
Net Income available to common stockholders plus assumed conversions                 $ 79,174 $ 75,975 $ 70,183
Net Income available to common stockholders plus assumed conversions (in shares)                 18,816 18,769 18,819
Net Income available to common stockholders plus assumed conversions (in dollars per share) $ 1.29 $ 1.34 $ 0.85 $ 0.72 $ 1.10 $ 1.43 $ 0.83 $ 0.69 $ 4.21 $ 4.05 [1] $ 3.73
Options                   $ 0 $ 0
[1] Total of quarterly amounts do not necessarily agree to the annual report amounts due to separate quarterly calculations of weighted average shares outstanding.