Unaudited Quarterly Results Of Operations (Quarterly Results Of Operations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 30, 2012	Jul. 08, 2012	Apr. 15, 2012	Oct. 02, 2011	Jul. 10, 2011	Apr. 17, 2011	Jan. 22, 2012	Jan. 23, 2011	Sep. 30, 2012	Oct. 02, 2011	Oct. 03, 2010
Selected Quarterly Financial Information [Abstract]
Revenues	$ 357,640	$ 362,981	$ 366,484	$ 366,960	$ 393,575	$ 383,773	$ 457,921	$ 518,031	$ 1,545,026	$ 1,662,339	$ 1,899,554
Earnings from operations	28,813	22,086	37,335	42,004	33,172	14,595	24,255	55,290	112,489	145,061	123,563
Net earnings	$ 12,477	$ 11,592	$ 21,632	$ 22,652	$ 18,745	$ 6,802	$ 11,950	$ 32,401
Net earnings per share, Basic (usd per share)	$ 0.28	$ 0.26	$ 0.49	$ 0.50	$ 0.39	$ 0.14	$ 0.27	$ 0.62	$ 1.31	$ 1.63	$ 1.28
Net earnings per share, Diluted (usd per share)	$ 0.27	$ 0.26	$ 0.48	$ 0.49	$ 0.38	$ 0.13	$ 0.27	$ 0.61	$ 1.28	$ 1.61	$ 1.26