SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2013	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Long-lived assets
Depreciation expense		$ 72,805	$ 73,395	$ 62,291
Melbourne galvenizing site equipment
Long-lived assets
Impairment of long-lived assets		$ 4,100
Delta EMD, Ltd.
Long-lived assets
Impairment of long-lived assets	$ 12,161
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