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. 29, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 30, 2017	[1]	Sep. 30, 2017	[1]	Jun. 24, 2017	[1]	Mar. 25, 2017	[1]	Dec. 24, 2016	[1]	Sep. 29, 2018		Sep. 30, 2017	Sep. 24, 2016
Net Income available to common stockholders																	$ 103,596		$ 79,174	$ 75,975
Net Income available to common stockholders (in shares)																	18,694		18,707	18,649
Net Income available to common stockholders (in dollars per share)																	$ 5.54		$ 4.23	$ 4.07
Options																			$ 0	$ 0
Options (in shares)																	123		109	120
Options (in dollars per share)																	$ (0.03)		$ (0.02)	$ (0.02)
Net Income available to common stockholders plus assumed conversions																	$ 103,596		$ 79,174	$ 75,975
Net Income available to common stockholders plus assumed conversions (in shares)																	18,817		18,816	18,769
Net Income available to common stockholders plus assumed conversions (in dollars per share)	$ 1.24		$ 1.39		$ 0.95		$ 1.93		$ 1.29		$ 1.34		$ 0.85		$ 0.72		$ 5.51	[1]	$ 4.21	$ 4.05

[1] Total of quarterly amounts do not necessarily agree to the annual report amounts due to separate quarterly calculations of weighted average shares outstanding.