RESTRUCTURING-RELATED ACTIVITIES - Restructuring and Related Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 9,775	$ 1,069	$ 5,754
GNP Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,832
Cash Outlays	2,581
GNP Restructuring Plan | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,381
Cash Outlays	2,581
GNP Restructuring Plan | Inventory impairments
Restructuring Cost and Reserve [Line Items]
Restructuring charges	699
Cash Outlays	0
GNP Restructuring Plan | Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	752
Cash Outlays	$ 0