NET INCOME (LOSS) PER SHARE - Basic and diluted net income (loss) per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jul. 03, 2021	Apr. 03, 2021	Jun. 27, 2020	Mar. 28, 2020	Jul. 03, 2021	Jun. 27, 2020
Numerator:
Net income (loss) attributable to common stockholders	$ (53,598)	$ 8,533	$ 16,414	$ (15,451)	$ (45,065)	$ 963
Weighted average common shares outstanding:
Basic	109,163,698		96,268,250		109,115,991	96,300,029
Diluted	109,163,698		96,654,697		109,115,991	96,719,370
Net (loss) income per share attributable to common stockholders:
Basic	$ (0.49)		$ 0.17		$ (0.41)	$ 0.01
Diluted	$ (0.49)		$ 0.17		$ (0.41)	$ 0.01