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Cover Page - USD ($)
 12 Months Ended
Dec. 28, 2019
Feb. 20, 2020
Jun. 29, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 28, 2019    
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 One Valmont Plaza,    
Entity Address, City or Town Omaha,    
Entity Address, State or Province NE    
Entity Address, Postal Zip Code  68154-5215    
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 Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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   21,544,582  
Entity Public Float     $ 2,908,458,040
Documents Incorporated by Reference
Portions of the Company’s proxy statement for its annual meeting of shareholders to be held on April 28, 2020 (the “Proxy Statement”), to be filed within 120 days of the fiscal year ended December 28, 2019, are incorporated by reference in Part III.
    
Entity Central Index Key 0000102729    
Amendment Flag false    
Current Fiscal Year End Date --12-28    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY