Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Selected Quarterly Financial Information [Line Items]
Effect of Fourth Quarter Events, Description	(a) Fourth quarter results include the impact of certain U.S. income tax reform enacted in December 2017 as further described in Note (12).
Revenue	$ 1,313,785	$ 1,276,007	$ 1,291,994	$ 1,260,486	$ 1,257,819	$ 1,184,557	$ 1,215,962	$ 1,138,135	$ 5,142,272	$ 4,796,473	$ 4,425,267
Earnings before income taxes	221,655	250,415	252,049	243,010	215,715	241,808	243,782	217,129	967,129	918,434	781,380
Net earnings	$ 336,658	$ 177,424	$ 179,683	$ 173,213	$ 149,691	$ 169,979	$ 166,454	$ 150,360	$ 866,978	$ 636,484	$ 539,362
Basic earnings per share	$ 1.02	$ 0.53	$ 0.54	$ 0.52	$ 0.45	$ 0.5	$ 0.49	$ 0.44	$ 2.62	$ 1.88	$ 1.57
Diluted earnings per share	$ 1.00	$ 0.52	$ 0.53	$ 0.52	$ 0.44	$ 0.49	$ 0.48	$ 0.43	$ 2.57	$ 1.85	$ 1.54
Voluntary Separation Plan Costs [Member]
Selected Quarterly Financial Information [Line Items]
Quarterly Financial Information, Quarterly Charges and Credits, Amount Affecting Comparability					$ 36,000