Quarterly Results (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 710,384	$ 676,482	$ 637,358	$ 641,212	$ 615,626	$ 571,640	$ 524,223	$ 491,664	$ 2,665,436	$ 2,203,153	$ 1,850,222
Earnings before income taxes	167,701	151,047	138,897	130,063	139,964	123,167	110,853	95,710	587,708	469,694	362,212
Net earnings	$ 111,808	$ 98,887	$ 97,829	$ 88,708	$ 91,192	$ 78,835	$ 72,044	$ 64,556	$ 397,232	$ 306,627	$ 237,272
Basic earnings per share	$ 0.65	$ 0.58	$ 0.57	$ 0.52	$ 0.54	$ 0.47	$ 0.43	$ 0.38	$ 2.32	$ 1.82	$ 1.44
Diluted earnings per share	$ 0.63	$ 0.56	$ 0.56	$ 0.51	$ 0.52	$ 0.45	$ 0.42	$ 0.37	$ 2.26	$ 1.76	$ 1.39