EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Reconciliation of shares for basic and diluted net income per share
Net income	$ 62,394	$ 51,445	$ 33,482	$ 8,480	$ 4,742	$ 21,302	$ 22,223	$ 2,167	$ 155,801	$ 50,434	$ 57,763
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average common shares outstanding - basic (in shares)									86,978	85,088	81,777
Effective of dilutive securities (in shares)									869	1,259	1,742
Weighted average common shares outstanding - diluted (in shares)									87,847	86,347	83,519
Earnings per share
Basic (in dollars per share)	$ 0.72	$ 0.59	$ 0.39	$ 0.10	$ 0.05	$ 0.25	$ 0.26	$ 0.03	$ 1.79	$ 0.59	$ 0.71
Diluted (in dollars per share)	$ 0.71	$ 0.58	$ 0.38	$ 0.10	$ 0.05	$ 0.25	$ 0.26	$ 0.03	$ 1.77	$ 0.58	$ 0.69