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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. 28, 2019
 [1]
Jun. 29, 2019
 [1]
Mar. 30, 2019
 [1]
Dec. 29, 2018
 [1]
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Net Income available to common stockholders         $ 94,819 $ 103,596 $ 79,174
Net Income available to common stockholders (in shares)         18,812 18,694 18,707
Net Income available to common stockholders (in dollars per share)         $ 5.04 $ 5.54 $ 4.23
Options         $ 0 $ 0 $ 0
Options (in shares)         147 123 109
Options (in dollars per share)         $ (0.04) $ (0.03) $ (0.02)
Net Income available to common stockholders plus assumed conversions         $ 94,819 $ 103,596 $ 79,174
Net Income available to common stockholders plus assumed conversions (in shares)         18,959 18,817 18,816
Net Income available to common stockholders plus assumed conversions (in dollars per share) $ 1.36 $ 1.63 $ 1.08 $ 0.93 $ 5.00 [1] $ 5.51 $ 4.21
[1] Total of quarterly amounts do not necessarily agree to the annual report amounts due to separate quarterly calculations of weighted average shares outstanding.