CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Income Statement [Abstract]
Net sales	$ 2,213,249	$ 2,017,762	$ 3,896,150	$ 3,581,840
Cost of merchandise sold	1,443,835	1,313,054	2,563,087	2,358,929
Gross profit	769,414	704,708	1,333,063	1,222,911
Selling, general and administrative expenses	452,346	405,736	878,459	787,850
Depreciation and amortization	43,610	41,047	86,397	80,774
Operating income	273,458	257,925	368,207	354,287
Interest expense, net	4,978	3,092	9,446	5,869
Income before income taxes	268,480	254,833	358,761	348,418
Income tax expense	61,191	94,184	80,039	127,458
Net income	$ 207,289	$ 160,649	$ 278,722	$ 220,960
Net income per share – basic	$ 1.70	$ 1.25	$ 2.26	$ 1.71
Net income per share – diluted	$ 1.69	$ 1.25	$ 2.25	$ 1.70
Weighted average shares outstanding:
Basic	122,100	128,186	123,288	129,231
Diluted	122,775	128,722	123,975	129,906
Dividends declared per common share outstanding	$ 0.31	$ 0.27	$ 0.58	$ 0.51