REVENUE - Disaggregation of Revenue (Details) - USD ($) $ 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
Disaggregation of Revenue [Line Items]
Net sales	$ 297,602	$ 229,125	$ 231,654	$ 155,353	$ 241,179	$ 196,109	$ 206,288	$ 135,257	$ 913,734	$ 778,833	$ 639,239
Sales Revenue | Customer Concentration Risk | One Customer
Disaggregation of Revenue [Line Items]
Customer concentration									15.00%	16.00%	14.00%
Sales Revenue | Customer Concentration Risk | Amazon Marketplace
Disaggregation of Revenue [Line Items]
Customer concentration									13.00%	10.00%
United States
Disaggregation of Revenue [Line Items]
Net sales									$ 873,867	$ 761,880	$ 635,195
International
Disaggregation of Revenue [Line Items]
Net sales									39,867	16,953	4,044
Coolers & Equipment
Disaggregation of Revenue [Line Items]
Net sales									368,874	331,224	312,237
Drinkware
Disaggregation of Revenue [Line Items]
Net sales									$ 526,241	424,164	310,287
Customer concentration									81.00%
Other
Disaggregation of Revenue [Line Items]
Net sales									$ 18,619	23,445	16,715
Wholesale
Disaggregation of Revenue [Line Items]
Net sales									527,634	491,431	444,854
Direct-to-consumer
Disaggregation of Revenue [Line Items]
Net sales									$ 386,100	$ 287,402	$ 194,385