CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Income Statement [Abstract]
Net sales	$ 294,603	$ 229,125	$ 715,953	$ 616,132
Cost of goods sold	120,627	109,049	311,994	303,152
Gross profit	173,976	120,076	403,959	312,980
Selling, general, and administrative expenses	103,864	86,071	271,152	235,191
Operating income	70,112	34,005	132,807	77,789
Interest expense	(1,963)	(5,319)	(7,730)	(17,081)
Other expense	(82)	(304)	(1,020)	(192)
Income before income taxes	68,067	28,382	124,057	60,516
Income tax expense	(16,622)	(7,080)	(30,650)	(14,824)
Net income	$ 51,445	$ 21,302	$ 93,407	$ 45,692
Net income per share
Basic (in dollars per share)	$ 0.59	$ 0.25	$ 1.07	$ 0.54
Diluted (in dollars per share)	$ 0.58	$ 0.25	$ 1.07	$ 0.53
Weighted-average common shares outstanding
Basic (in shares)	87,032	85,285	86,933	84,686
Diluted (in shares)	88,094	86,373	87,677	86,152