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CASH FLOW SUPPLEMENTARY INFORMATION (Details) (USD $)
0 Months Ended 3 Months Ended 11 Months Ended
May 13, 2014
Mar. 28, 2015
Mar. 29, 2014
Mar. 28, 2015
Feb. 24, 2015
May 13, 2014
CASH FLOW SUPPLEMENTARY INFORMATION            
Interest   $ 510,000us-gaap_InterestPaid $ 736,000us-gaap_InterestPaid      
Income taxes   5,047,000us-gaap_IncomeTaxesPaidNet 13,345,000us-gaap_IncomeTaxesPaidNet      
Increased Dividend (as a percent) 50.00%vmi_DividendIncreaseDecreaseOverPreviousYearPercentage          
Maximum amount of common stock authorized to repurchase under share repurchase program         250,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 500,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Period over which common stock are authorized to repurchase under share repurchase program 12 months          
Shares acquired under share repurchase program   598,227us-gaap_TreasuryStockSharesAcquired   3,309,376us-gaap_TreasuryStockSharesAcquired    
Value of shares acquired under share repurchase program   $ 72,900,000us-gaap_TreasuryStockValueAcquiredCostMethod   $ 467,900,000us-gaap_TreasuryStockValueAcquiredCostMethod