Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Income Statement [Abstract]
Net sales	$ 1,856,555	$ 1,698,352	$ 1,531,575
Cost of sales	700,555	646,429	603,614
Gross profit	1,156,000	1,051,923	927,961
Operating expenses:
Sales and marketing	771,195	766,922	687,380
General and administrative	158,999	137,956	119,378
Research and development	40,910	34,950	28,775
Total operating expenses	971,104	939,828	835,533
Operating income	184,896	112,095	92,428
Interest expense, net	8,924	11,587	5,907
Income before income taxes	175,972	100,508	86,521
Income tax expense	36,783	18,663	16,982
Net income	$ 139,189	$ 81,845	$ 69,539
Basic net income per share:
Net income - basic (in dollars per share)	$ 5.03	$ 2.78	$ 1.97
Weighted-average shares - basic (in shares)	27,665	29,472	35,256
Diluted net income per share:
Net income - diluted (in dollars per share)	$ 4.90	$ 2.70	$ 1.92
Weighted-average shares (in shares)	28,428	30,355	36,165