Consolidated Statements Of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Consolidated Statements Of Comprehensive Income [Abstract]
Net sales	$ 1,047,265	$ 1,006,083	$ 918,499
Cost of sales	179,404	180,190	159,682
Gross profit	867,861	825,893	758,817
Operating expenses:
Associate incentives	470,263	453,077	408,160
Selling, general and administrative	265,094	234,194	208,995
Total operating expenses	735,357	687,271	617,155
Earnings from operations	132,504	138,622	141,662
Other income (expense):
Interest income	2,185	1,480	1,116
Interest expense	(46)	(444)	(15)
Other, net	(3)	(1,106)	(174)
Other income (expense), net	2,136	(70)	927
Earnings before income taxes	134,640	138,552	142,589
Income taxes	72,105	38,511	47,917
Net earnings	$ 62,535	$ 100,041	$ 94,672
Earnings per common share
Basic	$ 2.57	$ 4.14	$ 3.72
Diluted	$ 2.53	$ 3.99	$ 3.59
Weighted average common shares outstanding
Basic	24,349	24,185	25,460
Diluted	24,708	25,047	26,355
Comprehensive income:
Net earnings	$ 62,535	$ 100,041	$ 94,672
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	14,995	(11,777)	(9,283)
Tax benefit (expense) related to foreign currency translation adjustment	(4,774)	3,906	3,375
Other comprehensive income (loss), net of tax	10,221	(7,871)	(5,908)
Comprehensive income	$ 72,756	$ 92,170	$ 88,764