Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Income Statement [Abstract]
Net sales	$ 934,978	$ 743,203	$ 605,676
Cost of sales	338,432	272,858	227,413
Gross profit	596,546	470,345	378,263
Operating Expenses:
Sales and marketing	398,205	317,502	269,901
General and administrative	66,617	58,106	53,572
Research and development	6,194	4,175	2,147
CEO transition costs	5,595	0	0
Asset impairment charges	148	109	260
Total operating expenses	476,759	379,892	325,880
Operating income	119,787	90,453	52,383
Other income (expense), net	218	(33)	(1,893)
Income before income taxes	120,005	90,420	50,490
Income tax expense	41,911	29,942	18,922
Net income	$ 78,094	$ 60,478	$ 31,568
Basic net income per share:
Net income per share – basic	$ 1.41	$ 1.10	$ 0.58
Weighted-average shares – basic	55,516	55,081	54,005
Diluted net income per share:
Net income per share – diluted	$ 1.37	$ 1.07	$ 0.57
Weighted-average shares – diluted	57,076	56,432	55,264