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