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SEGMENT AND GEOGRAPHICAL INFORMATION - Concentration Risk (Details)	3 Months Ended		6 Months Ended
	Jul. 01, 2022	Jul. 02, 2021	Jul. 01, 2022	Jul. 02, 2021
Geographic Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | CALIFORNIA
Concentration Risk [Line Items]
Concentration risk percentage	40.90%	34.80%	42.20%	34.50%
Geographic Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | NEW YORK
Concentration Risk [Line Items]
Concentration risk percentage	19.60%	21.60%	20.20%	21.80%
Top Ten Customers, Three Months Ended July 1, 2022 | Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member]
Concentration Risk [Line Items]
Concentration risk percentage	55.40%
Top Ten Customers, Six Months Ended July 1, 2022 | Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member]
Concentration Risk [Line Items]
Concentration risk percentage			54.40%
Top Ten Customers, Three Months Ended July 2, 2021 | Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member]
Concentration Risk [Line Items]
Concentration risk percentage		48.40%
Top Ten Customers, Six Months Ended July 2, 2021 | Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member]
Concentration Risk [Line Items]
Concentration risk percentage				46.20%
Los Angeles Department of Water and Power | Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member]
Concentration Risk [Line Items]
Concentration risk percentage		14.60%	15.80%
Los Angeles Department of Water and Power | Customer Concentration Risk [Member] | Revenue from Contract with Customer, Segment Benchmark [Member] | Energy
Concentration Risk [Line Items]
Concentration risk percentage	17.60%		19.20%
Consolidated Edison of New York | Customer Concentration Risk [Member] | Revenue from Contract with Customer, Segment Benchmark [Member] | Energy
Concentration Risk [Line Items]
Concentration risk percentage		11.50%
Consolidated Edison of New York | Customer Concentration Risk [Member] | Revenue from Contract with Customer, Segment Benchmark [Member] | Engineering and Consulting
Concentration Risk [Line Items]
Concentration risk percentage				10.90%
City of Elk Grove | Customer Concentration Risk [Member] | Revenue from Contract with Customer, Segment Benchmark [Member] | Engineering and Consulting
Concentration Risk [Line Items]
Concentration risk percentage		13.90%		15.80%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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-Publisher FASB
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