RESTRUCTURING-RELATED ACTIVITIES - Estimated Cost (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 30, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	$ 6,783
Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	4,673
Inventory adjustments
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	472
Asset impairments
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	884
Other
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	754
40 North Foods
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	570	$ 600
40 North Foods | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	449
40 North Foods | Inventory adjustments
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	0
40 North Foods | Asset impairments
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	103
40 North Foods | Other
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	18
GNP
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	6,213		$ 6,200
GNP | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	4,224
GNP | Inventory adjustments
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	472
GNP | Asset impairments
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	781
GNP | Other
Restructuring Cost and Reserve [Line Items]
Total Estimated Amount Expected to be Incurred	$ 736