GOODWILL AND INTANGIBLE ASSETS - Non-Amortized Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 25, 2021
Newmark
Non-amortized intangible assets
Carrying value of trade names	$ 11,111	$ 11,111
Webforge
Non-amortized intangible assets
Carrying value of trade names	7,107	7,877
Valmont SM
Non-amortized intangible assets
Carrying value of trade names		6,082
Ingal EPS/Ingal Civil Products
Non-amortized intangible assets
Carrying value of trade names	6,891	7,637
Shakespeare
Non-amortized intangible assets
Carrying value of trade names	4,000	4,000
Walpar
Non-amortized intangible assets
Carrying value of trade names	3,500	3,500
Conceal Fab
Non-amortized intangible assets
Carrying value of trade names	5,000
Convert
Non-amortized intangible assets
Carrying value of trade names	8,024	8,479
Other
Non-amortized intangible assets
Carrying value of trade names	14,152	14,721
Trade Name
Non-amortized intangible assets
Carrying value of trade names	$ 59,785	$ 63,407