Quarterly Results (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 795,328	$ 727,830	$ 707,561	$ 680,029	$ 710,384	$ 676,482	$ 637,358	$ 641,212	$ 2,910,748	$ 2,665,436	$ 2,203,153
Earnings before income taxes	86,505	172,747	169,189	159,613	167,701	151,047	138,897	130,063	588,054	587,708	469,694
Net earnings	$ 60,063	$ 115,344	$ 112,907	$ 110,040	$ 111,808	$ 98,887	$ 97,829	$ 88,708	$ 398,354	$ 397,232	$ 306,627
Basic earnings per share	$ 0.17	$ 0.34	$ 0.33	$ 0.32	$ 0.33	$ 0.29	$ 0.29	$ 0.26	$ 1.16	$ 1.16	$ 0.91
Diluted earnings per share	$ 0.17	$ 0.33	$ 0.32	$ 0.31	$ 0.32	$ 0.28	$ 0.28	$ 0.25	$ 1.13	$ 1.13	$ 0.88