Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Aug. 27, 2022 USD ($)	Dec. 25, 2021 USD ($)	Dec. 31, 2022 USD ($)	Dec. 26, 2020 USD ($) item
Indefinite-lived Intangible Assets
Number of trade names impaired \| item				2
Goodwill impairment			$ 0
Trade Name
Indefinite-lived Intangible Assets
Impairment of intangible assets	$ 0			$ 3,900
Valmont SM
Indefinite-lived Intangible Assets
Impairment of intangible assets		$ 2,013