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SUPPLEMENTAL FINANCIAL STATEMENT DATA - Goodwill (Details) $ in Thousands	6 Months Ended
	Jul. 04, 2025 USD ($)
Changes in carrying value of goodwill
Goodwill at beginning of period	$ 140,991
Additional Purchase Cost	41,385
Goodwill at end of period	182,376
Energy
Changes in carrying value of goodwill
Goodwill at beginning of period	139,222
Additional Purchase Cost	33,506
Goodwill at end of period	172,728
Engineering and Consulting
Changes in carrying value of goodwill
Goodwill at beginning of period	1,769
Additional Purchase Cost	7,879
Goodwill at end of period	$ 9,648

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