STOCK BASED COMPENSATION - Summary of non vested stock options (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
2012 Plan
Shares Under Outstanding Options
Non-Vested Options at beginning (in shares)	1,155
Forfeited (in shares)	(142)
Vested (in shares)	(570)
Non-Vested Options at ending (in shares)		1,155
Weighted Average Grant Date Fair Value
Non-Vested Options at beginning (in dollars per share)	$ 14.25
Granted (in dollars per share)		$ 7.22	$ 10.84
Forfeited (per share)	7.28
Vested (per share)	$ 21.47
Non-Vested Options at ending (in dollars per share)		$ 14.25
2018 Plan
Shares Under Outstanding Options
Granted (in shares)	601
Weighted Average Grant Date Fair Value
Granted (in dollars per share)	$ 7.67
2012 and 2018 Plans
Shares Under Outstanding Options
Non-Vested Options at ending (in shares)	1,044
Weighted Average Grant Date Fair Value
Non-Vested Options at ending (in dollars per share)	$ 7.47