Consolidated Statements Of Earnings (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Consolidated Statements Of Earnings [Abstract]
Net sales	$ 143,501	$ 135,006	$ 435,992	$ 380,104
Cost of sales	25,202	25,157	77,072	70,912
Gross profit	118,299	109,849	358,920	309,192
Operating expenses:
Associate incentives	66,158	60,560	198,725	171,743
Selling, general and administrative	33,365	30,751	103,038	87,358
Total operating expenses	99,523	91,311	301,763	259,101
Earnings from operations	18,776	18,538	57,157	50,091
Other income (expense):
Interest income	42	36	146	70
Interest expense	(1)	(42)	(9)	(68)
Other, net	92	557	97	301
Other income, net	133	551	234	303
Earnings before income taxes	18,909	19,089	57,391	50,394
Income taxes	6,524	6,240	19,800	17,134
Net earnings	$ 12,385	$ 12,849	$ 37,591	$ 33,260
Earnings per common share
Basic	$ 0.82	$ 0.83	$ 2.43	$ 2.16
Diluted	$ 0.81	$ 0.79	$ 2.39	$ 2.11
Weighted average common shares outstanding
Basic	15,043	15,562	15,495	15,397
Diluted	15,205	16,247	15,712	15,763