DIVESTITURES (Details) kr in Thousands, $ in Thousands				3 Months Ended	12 Months Ended
	Apr. 30, 2023 USD ($)	Nov. 30, 2022 USD ($)	Nov. 30, 2022 DKK (kr)	Jul. 01, 2023 USD ($)	Dec. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 25, 2021 USD ($)	Nov. 30, 2022 DKK (kr)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of long-lived assets					$ 140,844		$ 27,911
Pre-tax gain on sale of engineering and equipment					$ 2,994	$ (33,273)
Valmont SM, Offshore Wind Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating income						$ 2,259	(40,192)
Net proceeds		$ 12,570	kr 90,000
Impairment of long-lived assets							$ 27,900
Escrow deposit		2,189						kr 15,000
Cash and cash equivalents		12,420
Receivables, net		35,407
Inventories		1,144
Contract assets		19,127
Prepaid expenses and other assets		1,852
Net property, plant, and equipment		12,915
Intangible assets		5,579
Other assets		1,103
Total assets		89,547
Accounts payable		23,611
Contract liabilities		34,814
Accrued expenses		4,737
Deferred income taxes		1,375
Total liabilities		64,537
Net assets		$ 25,010
Torrent Engineering and Equipment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds	$ 6,369
Pre-tax gain on sale of engineering and equipment				$ 2,994
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]				Nonoperating Income (Expense)