STOCKHOLDERS' EQUITY - Changes to the Unvested Stock Options (Details) - Performance Restricted Stock Units [Member]	12 Months Ended
	Dec. 28, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested performance shares, beginning balance | shares	120,600	[1]
Non-vested performance shares, granted | shares	43,700	[1]
Non-vested performance shares, vested | shares	0	[1]
Non-vested performance shares, performance unit adjustments | shares	(12,600)	[1],[2]
Non-vested performance shares, canceled | shares	(3,800)	[1]
Non-vested performance shares, ending balance | shares	147,900	[1]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance, weighted average grant date value | $ / shares	$ 42.17
Granted, weighted average grant date fair value | $ / shares	78.33
Vested, weighted average grant date fair value | $ / shares	0.00
Performance unit adjustments, weighted average grant date fair value | $ / shares	89.00
Canceled, weighted average grant date fair value | $ / shares	86.80
Ending balance, weighted average grant date fair value | $ / shares	$ 47.73

[1] All non-vested stock performance units are expected to vest.

[2] Adjustments based on final evaluations for non-vested performance stock units.