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SEGMENT AND GEOGRAPHICAL INFORMATION - Concentration Risk (Details) - Revenue from Contract with Customer Benchmark	3 Months Ended		9 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Sep. 29, 2023	Sep. 30, 2022
Customer Concentration Risk | Top Ten Customers
Concentration Risk
Concentration risk (as a percent)	52.90%	57.20%	50.60%	54.50%
Customer Concentration Risk | Los Angeles Department of Water and Power
Concentration Risk
Concentration risk (as a percent)				13.20%
Customer Concentration Risk | Pueblo County School District
Concentration Risk
Concentration risk (as a percent)		13.30%
Customer Concentration Risk | Pueblo County School District and Dormitory Authority State of New York | Energy
Concentration Risk
Concentration risk (as a percent)	21.70%
Customer Concentration Risk | Pueblo County School District, Dormitory Authority State of New York, and Los Angeles Department of Water and Power | Energy
Concentration Risk
Concentration risk (as a percent)		38.30%
Customer Concentration Risk | Los Angeles Department of Water and Power, and The Dormitory Authority State of New York | Energy
Concentration Risk
Concentration risk (as a percent)			22.70%	26.50%
Geographic Concentration Risk | California
Concentration Risk
Concentration risk (as a percent)	42.80%	37.20%	42.20%	40.30%
Geographic Concentration Risk | New York
Concentration Risk
Concentration risk (as a percent)	23.60%	23.40%	24.70%	21.40%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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