REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 02, 2021	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 375,768	$ 294,603	$ 246,938	$ 174,412	$ 297,602	$ 229,125	$ 231,654	$ 155,353	$ 1,091,721	$ 913,734	$ 778,833
United States
Disaggregation of Revenue [Line Items]
Net sales									1,025,393	873,867	761,880
International
Disaggregation of Revenue [Line Items]
Net sales									66,328	39,867	16,953
Coolers & Equipment
Disaggregation of Revenue [Line Items]
Net sales									446,585	368,874	331,224
Drinkware
Disaggregation of Revenue [Line Items]
Net sales									628,566	526,241	424,164
Other
Disaggregation of Revenue [Line Items]
Net sales									16,570	18,619	23,445
Wholesale
Disaggregation of Revenue [Line Items]
Net sales									510,861	527,634	491,431
Direct-to-consumer
Disaggregation of Revenue [Line Items]
Net sales									$ 580,860	$ 386,100	$ 287,402