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
	Sep. 30, 2018	Jul. 08, 2018	Apr. 15, 2018	Oct. 01, 2017	Jul. 09, 2017	Apr. 16, 2017	Jan. 21, 2018	Jan. 22, 2017	Sep. 30, 2018		Oct. 01, 2017		Oct. 02, 2016
Selected Quarterly Financial Information [Abstract]
Revenues	$ 177,472	$ 187,983	$ 209,772	$ 232,125	$ 246,101	$ 265,884	$ 294,463	$ 353,181	$ 869,690		$ 1,097,291		$ 1,162,258
Earnings from operations	35,647	76,340	46,820	60,066	55,438	59,760	72,807	66,789	231,614		242,053		191,493
Net Income (Loss) Attributable to Parent	$ 16,269	$ 45,307	$ 47,605	$ 29,958	$ 36,351	$ 33,094	$ 12,190	$ 35,929	$ 121,371		$ 135,332		$ 124,073
Net earnings per share, Basic (usd per share)	$ 0.61	$ 1.62	$ 1.64	$ 1.02	$ 1.23	$ 1.07	$ 0.41	$ 1.12	$ 4.26	[1]	$ 4.42	[1]	$ 3.68	[1]
Net earnings per share, Diluted (usd per share)	$ 0.60	$ 1.60	$ 1.62	$ 1.01	$ 1.22	$ 1.06	$ 0.41	$ 1.11	$ 4.21	[1]	$ 4.38	[1]	$ 3.63	[1]

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