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SEGMENT AND GEOGRAPHICAL INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2022	Sep. 30, 2022	Jul. 01, 2022	Apr. 01, 2022	Dec. 31, 2021	Oct. 01, 2021	Jul. 02, 2021	Apr. 02, 2021	Dec. 30, 2022	Dec. 31, 2021	Jan. 01, 2021
Revenue
Revenue	$ 113,256	$ 121,399	$ 102,645	$ 91,838	$ 92,218	$ 98,297	$ 84,154	$ 79,086	$ 429,138	$ 353,755	$ 390,980
Domestic
Revenue
Revenue									429,138	353,755	390,980
Energy
Revenue
Revenue									357,460	286,384	324,178
Energy | Domestic
Revenue
Revenue									357,460	286,384	324,178
Engineering and Consulting
Revenue
Revenue									71,678	67,371	66,802
Engineering and Consulting | Domestic
Revenue
Revenue									71,678	67,371	66,802
Commercial
Revenue
Revenue									35,348	29,864	41,367
Commercial | Energy
Revenue
Revenue									29,782	24,541	36,212
Commercial | Engineering and Consulting
Revenue
Revenue									5,566	5,323	5,155
Government
Revenue
Revenue									192,463	127,148	155,233
Government | Energy
Revenue
Revenue									126,494	65,249	93,821
Government | Engineering and Consulting
Revenue
Revenue									65,969	61,899	61,412
Utilities
Revenue
Revenue									201,327	196,743	194,380
Utilities | Energy
Revenue
Revenue									201,184	196,594	194,145
Utilities | Engineering and Consulting
Revenue
Revenue									143	149	235
Time-and-Materials Contract
Revenue
Revenue									86,075	86,213	101,752
Time-and-Materials Contract | Energy
Revenue
Revenue									32,491	34,004	47,912
Time-and-Materials Contract | Engineering and Consulting
Revenue
Revenue									53,584	52,209	53,840
Unit-based Contract
Revenue
Revenue									194,805	190,999	180,186
Unit-based Contract | Energy
Revenue
Revenue									180,509	180,311	170,991
Unit-based Contract | Engineering and Consulting
Revenue
Revenue									14,296	10,688	9,195
Fixed-Price Contract
Revenue
Revenue									148,258	76,543	109,042
Fixed-Price Contract | Energy
Revenue
Revenue									144,460	72,069	105,275
Fixed-Price Contract | Engineering and Consulting
Revenue
Revenue									$ 3,798	$ 4,474	$ 3,767

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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