SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PP&E (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Long-lived assets
Depreciation expense	$ 67,499	$ 69,046	$ 66,482
Buildings and improvements | Minimum
Long-lived assets
Estimated useful lives	15 years
Buildings and improvements | Maximum
Long-lived assets
Estimated useful lives	40 years
Machinery and equipment | Minimum
Long-lived assets
Estimated useful lives	3 years
Machinery and equipment | Maximum
Long-lived assets
Estimated useful lives	12 years
Transportation equipment | Minimum
Long-lived assets
Estimated useful lives	3 years
Transportation equipment | Maximum
Long-lived assets
Estimated useful lives	24 years
Office furniture and equipment | Minimum
Long-lived assets
Estimated useful lives	3 years
Office furniture and equipment | Maximum
Long-lived assets
Estimated useful lives	7 years