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GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Changes in carrying value of goodwill
Goodwill at beginning of period	$ 131,144	$ 130,124
Additional Purchase Cost	9,847	1,020
Additions/Adjustments	0	0
Goodwill at end of period	140,991	131,144
Energy
Changes in carrying value of goodwill
Goodwill at beginning of period	129,375	129,375
Additional Purchase Cost	9,847	0
Additions/Adjustments	0	0
Goodwill at end of period	139,222	129,375
Engineering and Consulting
Changes in carrying value of goodwill
Goodwill at beginning of period	1,769	749
Additional Purchase Cost	0	1,020
Additions/Adjustments	0	0
Goodwill at end of period	$ 1,769	$ 1,769

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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