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SEGMENT AND GEOGRAPHICAL INFORMATION - Concentration Risk (Details)	12 Months Ended
	Dec. 30, 2022	Dec. 31, 2021	Jan. 01, 2021
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Top Ten Customers
Concentration Risk
Concentration risk (as a percent)	54.60%	49.20%	48.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Los Angeles Department of Water and Power
Concentration Risk
Concentration risk (as a percent)	12.00%	10.80%	10.20%
Revenue from Contract with Customer Benchmark | Geographic Concentration Risk | California
Concentration Risk
Concentration risk (as a percent)	41.70%	36.80%	37.00%
Revenue from Contract with Customer Benchmark | Geographic Concentration Risk | New York
Concentration Risk
Concentration risk (as a percent)	22.80%	21.00%	19.20%
Revenue from Contract with Customer, Segment Benchmark | Customer Concentration Risk | Los Angeles Department of Water and Power | Energy
Concentration Risk
Concentration risk (as a percent)	14.40%
Revenue from Contract with Customer, Segment Benchmark | Customer Concentration Risk | Los Angeles Department of Water and Power, Duke Energy, and Consolidated Edison of New York | Energy
Concentration Risk
Concentration risk (as a percent)		34.50%
Revenue from Contract with Customer, Segment Benchmark | 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)			22.50%
Revenue from Contract with Customer, Segment Benchmark | Customer Concentration Risk | City of Elk Grove | Engineering and Consulting
Concentration Risk
Concentration risk (as a percent)		10.30%	18.20%

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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.

+ References

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