Unaudited Quarterly Results Of Operations (Quarterly Results Of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Oct. 01, 2017	Jul. 09, 2017	Apr. 16, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 10, 2016	Jan. 22, 2017	Jan. 17, 2016	Oct. 01, 2017		Oct. 02, 2016		Sep. 27, 2015
Selected Quarterly Financial Information [Abstract]
Revenues	$ 338,746	$ 357,846	$ 369,389	$ 398,419	$ 368,938	$ 361,151	$ 487,933	$ 470,823	$ 1,553,914		$ 1,599,331		$ 1,540,317
Earnings from operations	60,393	66,981	65,650	58,910	55,705	52,786	73,117	62,514	266,141		229,915		197,173
Net Income (Loss) Attributable to Parent	$ 29,958	$ 36,351	$ 33,094	$ 31,981	$ 30,189	$ 28,682	$ 35,929	$ 33,221	$ 135,332		$ 124,073		$ 108,812
Net earnings per share, Basic (usd per share)	$ 1.02	$ 1.23	$ 1.07	$ 0.98	$ 0.92	$ 0.85	$ 1.12	$ 0.94	$ 4.42	[1]	$ 3.68	[1]	$ 2.89	[1]
Net earnings per share, Diluted (usd per share)	$ 1.01	$ 1.22	$ 1.06	$ 0.97	$ 0.91	$ 0.84	$ 1.11	$ 0.92	$ 4.38	[1]	$ 3.63	[1]	$ 2.85	[1]

[1] ________________________(1) Earnings per share may not add due to rounding.