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GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 28, 2015
Dec. 27, 2014
Webforge    
Non-amortized intangible assets    
Carrying value of trade names $ 16,052us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_WebforgeMember		 $ 16,801us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_WebforgeMember
Valmont SM    
Non-amortized intangible assets    
Carrying value of trade names 9,043us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_ValmontSMMember		 10,818us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_ValmontSMMember
Newmark    
Non-amortized intangible assets    
Carrying value of trade names 11,111us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_NewmarkMember		 11,111us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_NewmarkMember
Ingal EPS/Ingal Civil Products    
Non-amortized intangible assets    
Carrying value of trade names 8,472us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_IngalEPSOrIngalCivilProductsMember		 8,867us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_IngalEPSOrIngalCivilProductsMember
Donhad    
Non-amortized intangible assets    
Carrying value of trade names 6,391us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_DonhadMember		 6,689us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_DonhadMember
Shakespeare Member    
Non-amortized intangible assets    
Carrying value of trade names 4,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_ShakespeareMember		 4,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_ShakespeareMember
Industrial Galvanizers    
Non-amortized intangible assets    
Carrying value of trade names 3,716us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_IndustrialGalvanizersMember		 3,889us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_IndustrialGalvanizersMember
Other    
Non-amortized intangible assets    
Carrying value of trade names 14,257us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_OtherTradeNamesMember		 14,852us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= vmi_OtherTradeNamesMember
Trade names    
Non-amortized intangible assets    
Carrying value of trade names $ 73,042us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 $ 77,027us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember