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BUSINESS COMBINATIONS - Pro Forma Information - Tabular Disclosure (Details) - Alternative Power Generation, Inc., Alternative Power Generation, Inc., and Enica Engineering, PLLC - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2025	Sep. 27, 2024	Oct. 03, 2025	Sep. 27, 2024
Business Acquisition, Pro Forma Information
Pro forma revenue	$ 182,006	$ 170,920	$ 511,736	$ 460,058
Pro forma income (loss) from operations	14,862	11,159	33,462	27,859
Pro forma net income (loss)	$ 13,721	$ 9,796	$ 33,556	$ 21,481
Earnings (loss) per share, basic (in dollars per share)	$ 0.94	$ 0.7	$ 2.33	$ 1.56
Earnings (loss) per share, diluted (in dollars per share)	$ 0.9	$ 0.68	$ 2.24	$ 1.52
Weighted average shares outstanding, basic (in shares)	14,603	13,930	14,397	13,753
Weighted average shares outstanding, diluted (in shares)	15,229	14,358	14,987	14,130

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