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SUPPLEMENTAL FINANCIAL STATEMENT DATA - Goodwill (Details) $ in Thousands	9 Months Ended
	Oct. 03, 2025 USD ($)
Changes in carrying value of goodwill
Goodwill at beginning of period	$ 140,991
Additional purchase cost	36,515
Goodwill at end of period	177,506
Energy
Changes in carrying value of goodwill
Goodwill at beginning of period	139,222
Additional purchase cost	31,613
Goodwill at end of period	170,835
Engineering and Consulting
Changes in carrying value of goodwill
Goodwill at beginning of period	1,769
Additional purchase cost	4,902
Goodwill at end of period	$ 6,671

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