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SUPPLEMENTAL FINANCIAL STATEMENT DATA - Goodwill (Details) $ in Thousands	3 Months Ended
	Apr. 03, 2026 USD ($)
Changes in carrying value of goodwill
Goodwill at beginning of period	$ 179,530
Additions / adjustments	15
Goodwill at end of period	179,545
Energy
Changes in carrying value of goodwill
Goodwill at beginning of period	170,835
Goodwill at end of period	170,835
Engineering and Consulting
Changes in carrying value of goodwill
Goodwill at beginning of period	8,695
Additions / adjustments	15
Goodwill at end of period	$ 8,710

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