CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ (50,315)	$ 72,930	$ 110,828	$ 213,043
Foreign currency translation adjustments:
Unrealized translation loss	(28,342)	(46,000)	(8,186)	(78,050)
Hedging activities:
Unrealized loss on commodity hedges	(397)	(2,233)	(3,212)	(1,185)
Realized loss on commodity hedges recorded in earnings	743	1,546	4,540	1,048
Unrealized gain on cross currency swaps	2,072	5,592	721	10,873
Amortization cost included in interest expense	(12)	(16)	(40)	(48)
Total hedging activities	2,406	4,889	2,009	10,688
Net gain on defined benefit pension plan	95	115	281	371
Other comprehensive loss	(25,841)	(40,996)	(5,896)	(66,991)
Comprehensive income (loss)	(76,156)	31,934	104,932	146,052
Comprehensive loss (income) attributable to noncontrolling interests	1,098	242	3,233	(514)
Comprehensive income (loss) attributable to Valmont Industries, Inc.	$ (75,058)	$ 32,176	$ 108,165	$ 145,538