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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020	Dec. 26, 2020
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 894,629	$ 688,808	$ 1,669,515	$ 1,363,008
Contract assets	140,146		140,146		$ 123,495
Contract liabilities	252,676		252,676		170,919
Contract liabilities, current	156,481		156,481		$ 130,018
Revenue recognized from contract liability	31,267	21,037	69,369	39,277
Remaining performance obligations	$ 200,283		$ 200,283
Minimum
Disaggregation of Revenue [Line Items]
Remaining performance obligations, expected timing of satisfaction period	12 months		12 months
Maximum
Disaggregation of Revenue [Line Items]
Remaining performance obligations, expected timing of satisfaction period	24 months		24 months
Contract Liabilities
Disaggregation of Revenue [Line Items]
Contract liabilities, current	$ 156,481		$ 156,481
Other Noncurrent Liabilities
Disaggregation of Revenue [Line Items]
Contract liabilities, noncurrent	96,195		96,195
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	621,636	449,101	1,138,004	894,236
Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	272,993	239,707	531,511	468,772
Utility Support Structures Segment
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	267,863	228,473	520,561	451,421
Utility Support Structures Segment | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	9,127	4,619	15,421	13,543
Utility Support Structures Segment | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	258,736	223,854	505,140	437,878
Engineered Support Structures Segment
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	269,340	248,873	491,496	476,239
Engineered Support Structures Segment | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	260,001	236,827	473,847	452,706
Engineered Support Structures Segment | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	9,339	12,046	17,649	23,533
Coatings Segment
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	77,605	62,667	149,196	131,257
Coatings Segment | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	77,605	62,667	149,196	131,257
Coatings Segment | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0	0
Irrigation Segment
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	279,821	148,795	508,262	304,091
Irrigation Segment | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	274,903	144,988	499,540	296,730
Irrigation Segment | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 4,918	$ 3,807	$ 8,722	$ 7,361

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