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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. 26, 2020
 [1]
Jun. 30, 2020
 [1]
Mar. 28, 2020
 [1]
Dec. 28, 2019
 [1]
Sep. 28, 2019
 [1]
Jun. 29, 2019
 [1]
Mar. 30, 2019
 [1]
Dec. 29, 2018
 [1]
Sep. 26, 2020
Sep. 28, 2019
Sep. 29, 2018
Net Income available to common stockholders                 $ 18,305 $ 94,819 $ 103,596
Net Income available to common stockholders (in shares)                 18,901 18,812 18,694
Net Income available to common stockholders (in dollars per share)                 $ 0.97 $ 5.04 $ 5.54
Options                 $ 0 $ 0 $ 0
Options (in shares)                 131 147 123
Options (in dollars per share)                 $ (0.01) $ (0.04) $ (0.03)
Net Income available to common stockholders plus assumed conversions                 $ 18,305 $ 94,819 $ 103,596
Net Income available to common stockholders plus assumed conversions (in shares)                 19,032 18,959 18,817
Net Income available to common stockholders plus assumed conversions (in dollars per share) $ 0.35 $ (0.67) $ 0.38 $ 0.89 $ 1.36 $ 1.63 $ 1.08 $ 0.93 $ 0.96 [1] $ 5.00 [1] $ 5.51
[1] Total of quarterly amounts do not necessarily agree to the annual amounts due to separate quarterly calculations of weighted average shares outstanding.