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Cover Page - shares
6 Months Ended
Jun. 29, 2024
Jul. 26, 2024
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 29, 2024  
Current Fiscal Year End Date --12-28  
Document Transition Report false  
Entity File Number 1-31429  
Entity Registrant Name Valmont Industries, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 47-0351813  
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  
Title of 12(b) Security Common Stock, $1.00 par value  
Trading Symbol VMI  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Smaller Reporting Company false  
Emerging Growth Company false  
Shell Company false  
Entity Common Stock, Shares Outstanding   20,165,853
Entity Central Index Key 0000102729  
Amendment Flag false  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q2