Document and Entity Information
Document and Entity Information Document | Oct. 19, 2021 | Oct. 18, 2021 | May 20, 2021 | Oct. 21, 2020 |
Cover [Abstract] | ||||
Document Type | 8-K | |||
Document Period End Date | Oct. 18, 2021 | |||
Entity Registrant Name | Valmont Industries, Inc. | |||
Entity Central Index Key | 0000102729 | |||
Amendment Flag | false | |||
Entity Incorporation, State or Country Code | DE | |||
Entity File Number | 1-31429 | |||
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 | |||
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 |