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DISCLOSURES ABOUT THE FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) | Dec. 31, 2016 | Dec. 26, 2015
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets recorded for the investments held | $ 35,784,000 | $ 37,963,000
Liabilities recorded for the investments held | 37,963 | 36,439
Level 1 member |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading Securities | 37,800,000 | 42,697,000
Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 755,646,000 | 757,995,000
Trading Securities | 37,800,000 | 42,697,000
Estimated fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 731,633,000 | 724,020,000
EMD |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of remaining ownership | 2,016,000 | 4,734,000
Valmont Deferred Compensation Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets recorded for the investments held | $ 35,784,000 | $ 37,963,000

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