RESTRUCTURING-RELATED ACTIVITIES - Costs Incurred and Cash Outlays (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Mar. 26, 2017
Restructuring Cost and Reserve [Line Items]
Expenses	$ 789	$ 0
Cash Outlays	701
Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Expenses	546
Cash Outlays	641
Inventory adjustments
Restructuring Cost and Reserve [Line Items]
Expenses	(227)
Cash Outlays	0
Asset impairments
Restructuring Cost and Reserve [Line Items]
Expenses	470
Cash Outlays	0
Other
Restructuring Cost and Reserve [Line Items]
Expenses	0
Cash Outlays	$ 60