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DISCLOSURES ABOUT THE FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands | Dec. 25, 2021 | Dec. 26, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets recorded for the investments held | $ 29,982 | $ 35,125
Liabilities recorded for the investments held | 29,982 | 35,125
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 30,076 | 35,327
Derivative financial instruments, net | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Derivative financial instruments, net | (4,007) | (5,911)
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Derivative financial instruments, net | 0 | 0
Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 951,956 | 731,179
Trading securities | 30,076 | 35,327
Derivative financial instruments, net | (4,007) | (5,911)
Estimated Fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt | 1,175,332 | 884,846
EMD |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of remaining ownership | 94 | 202
Valmont Deferred Compensation Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets recorded for the investments held | 29,982 | 35,125
Liabilities recorded for the investments held | $ 29,982 | $ 35,125

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