CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income Statement [Abstract]
Net sales	$ 297,602	$ 229,125	$ 231,654	$ 155,353	$ 241,179	$ 196,109	$ 206,288	$ 135,257	$ 913,734	$ 778,833	$ 639,239
Cost of goods sold									438,420	395,705	344,638
Gross profit	$ 162,334	$ 120,076	$ 116,277	$ 76,627	$ 127,828	$ 97,541	$ 100,570	$ 57,189	475,314	383,128	294,601
Selling, general, and administrative expenses									385,543	280,972	230,634
Operating income									89,771	102,156	63,967
Interest expense									(21,779)	(31,280)	(32,607)
Other (expense) income									(734)	(1,261)	699
Income before income taxes									67,258	69,615	32,059
Income tax expense									(16,824)	(11,852)	(16,658)
Net income									$ 50,434	$ 57,763	$ 15,401
Net income per share
Basic (in dollars per share)	$ 0.05	$ 0.25	$ 0.26	$ 0.03	$ 0.30	$ 0.21	$ 0.23	$ (0.04)	$ 0.59	$ 0.71	$ 0.19
Diluted (in dollars per share)	$ 0.05	$ 0.25	$ 0.26	$ 0.03	$ 0.30	$ 0.21	$ 0.23	$ (0.04)	$ 0.58	$ 0.69	$ 0.19
Weighted-average common shares outstanding
Basic (in shares)									85,088	81,777	81,479
Diluted (in shares)									86,347	83,519	82,972