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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Net sales $ 1,531,575 $ 1,444,497 $ 1,311,291
Cost of sales 603,614 547,150 501,131
Gross profit 927,961 897,347 810,160
Operating expenses:      
Sales and marketing 687,380 650,357 595,845
General and administrative 119,378 127,269 109,674
Research and development 28,775 27,806 27,991
Total operating expenses 835,533 805,432 733,510
Operating income 92,428 91,915 76,650
Other expense, net 5,907 877 717
Income before income taxes 86,521 91,038 75,933
Income tax expense 16,982 25,961 24,516
Net income $ 69,539 $ 65,077 $ 51,417
Basic net income per share:      
Net income per share – basic $ 1.97 $ 1.58 $ 1.11
Weighted-average shares – basic 35,256,000 41,212,000 46,154,000
Diluted net income per share:      
Net income per share – diluted $ 1.92 $ 1.55 $ 1.10
Weighted-average shares – diluted 36,165,000 42,085,000 46,902,000