Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Income Statement [Abstract]
Net sales	$ 1,311,291	$ 1,213,699	$ 1,156,757
Cost of sales	501,131	472,948	449,907
Gross profit	810,160	740,751	706,850
Operating expenses:
Sales and marketing	595,845	550,475	512,007
General and administrative	109,674	99,209	84,864
Research and development	27,991	15,971	8,233
Total operating expenses	733,510	665,655	605,104
Operating income	76,650	75,096	101,746
Other (expense) income, net	(717)	334	362
Income before income taxes	75,933	75,430	102,108
Income tax expense	24,516	24,911	34,134
Net income	$ 51,417	$ 50,519	$ 67,974
Basic net income per share:
Net income per share – basic	$ 1.11	$ 0.99	$ 1.27
Weighted-average shares – basic	46,154,000	51,252,000	53,452,000
Diluted net income per share:
Net income per share – diluted	$ 1.10	$ 0.97	$ 1.25
Weighted-average shares – diluted	46,902,000	52,101,000	54,193,000