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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Dec. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets recorded for the investments held | $ 26,803 | $ 25,008
Reported Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 26,803 | 25,008
Derivative financial instruments, net | 2,860 | 1,404
Cash and cash equivalents - mutual funds | 6,258 | 7,205
Long-term debt | 1,108,604 | 872,129
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 26,803 | 25,008
Derivative financial instruments, net | 0 | 0
Cash and cash equivalents - mutual funds | 6,258 | 7,205
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative financial instruments, net | 2,860 | 1,404
Cash and cash equivalents - mutual funds | 0 |
Long-term debt | 1,064,916 | 807,281
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative financial instruments, net | 0 | 0
Cash and cash equivalents - mutual funds | 0 |
Valmont Deferred Compensation Plan [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets recorded for the investments held | $ 26,803 | $ 25,008

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