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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 03, 2015
Sep. 27, 2014
Oct. 03, 2015
Sep. 27, 2014
Income Statement [Abstract]        
Net sales $ 373,919 $ 323,366 $ 999,017 $ 834,541
Cost of sales 140,283 124,782 379,009 322,177
Gross profit 233,636 198,584 620,008 512,364
Operating expenses:        
Sales and marketing 156,899 137,863 424,029 369,597
General and administrative 27,817 23,022 79,951 63,183
Research and development 3,521 2,353 10,275 5,725
Total operating expenses 188,237 163,238 514,255 438,505
Operating income 45,399 35,346 105,753 73,859
Other income, net 78 96 364 276
Income before income taxes 45,477 35,442 106,117 74,135
Income tax expense 13,623 11,888 34,426 25,108
Net income $ 31,854 $ 23,554 $ 71,691 $ 49,027
Basic net income per share:        
Net income per share – basic (in USD per share) $ 0.63 $ 0.44 $ 1.39 $ 0.91
Weighted-average shares – basic (in shares) 50,945,000 53,271,000 51,654,000 53,677,000
Diluted net income per share:        
Net income per share – diluted (in USD per share) $ 0.62 $ 0.44 $ 1.36 $ 0.90
Weighted-average shares – diluted (in shares) 51,701,000 53,971,000 52,524,000 54,358,000