Note Q - Quarterly Financial Data (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Sep. 29, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 30, 2017		Sep. 30, 2017		Jun. 24, 2017		Mar. 25, 2017		Dec. 24, 2016		Sep. 29, 2018		Sep. 30, 2017	Sep. 24, 2016
Revenues, Total	$ 300,715		$ 306,239		$ 266,101		$ 265,210		$ 316,726		$ 295,415		$ 246,513		$ 225,570		$ 1,138,265		$ 1,084,224	$ 992,781
Gross Profit	91,254		94,475		77,278		73,279		97,547		94,764		72,817		65,895		336,286		331,023	304,467
Net Earnings	$ 23,385		$ 26,129		$ 17,833		$ 36,249		$ 24,343		$ 25,304		$ 15,987		$ 13,540		$ 103,596		$ 79,174	$ 75,975
Net Income available to common stockholders plus assumed conversions (in dollars per share)	$ 1.24	[1]	$ 1.39	[1]	$ 0.95	[1]	$ 1.93	[1]	$ 1.29	[1]	$ 1.34	[1]	$ 0.85	[1]	$ 0.72	[1]	$ 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.