Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Income Statement [Abstract]
Net sales	$ 352,980	$ 349,809
Cost of sales	143,906	133,976
Gross profit	209,074	215,833
Operating expenses:
Sales and marketing	150,668	140,503
General and administrative	30,906	28,254
Research and development	7,602	3,351
Total operating expenses	189,176	172,108
Operating income	19,898	43,725
Other (expense) income, net	(97)	153
Income before income taxes	19,801	43,878
Income tax expense	6,832	15,079
Net income	$ 12,969	$ 28,799
Basic net income per share:
Net income per share – basic (in USD per share)	$ 0.27	$ 0.55
Weighted-average shares – basic (in shares)	48,100,000	52,346,000
Diluted net income per share:
Net income per share – diluted (in USD per share)	$ 0.27	$ 0.54
Weighted-average shares – diluted (in shares)	48,845,000	53,326,000