v3.25.2
Cover
Jul. 10, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jul. 10, 2025
Entity File Number 1-31429
Entity Registrant Name Valmont Industries, Inc.
Entity Central Index Key 0000102729
Entity Tax Identification Number 47-0351813
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 15000 Valmont Plaza
Entity Address, City or Town Omaha
Entity Address, State or Province NE
Entity Address, Postal Zip Code 68154
City Area Code 402
Local Phone Number 963-1000
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $1.00 par value
Trading Symbol VMI
Security Exchange Name NYSE
Entity Emerging Growth Company false