STOCK BASED COMPENSATION - Summary of non vested stock options (Details) - $ / shares shares in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Shares Under Outstanding Options
Non-Vested Options at beginning (in shares)	1,044
Granted (in shares)	0
Forfeited (in shares)	(117)
Vested (in shares)	(388)
Non-Vested Options at ending (in shares)	539	1,044
Weighted Average Grant Date Fair Value
Non-Vested Options at beginning (in dollars per share)	$ 7.47
Granted (in dollars per share)	0	$ 7.67	$ 7.22
Forfeited (in dollars per share)	7.81
Vested (in dollars per share)	7.41
Non-Vested Options at ending (in dollars per share)	$ 7.44	$ 7.47