Segment and Geographical Information - Reconciliation of Other Significant Reconciling Items from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020
Segment Reporting Information [Line Items]
Segment gross profit as reviewed by CODM	$ 61,031	$ 25,652	$ 110,905	$ 54,836
Adjusted EBITDA	77,194	55,633	22,472	76,679
Residential, Light Commercial
Segment Reporting Information [Line Items]
Total segment revenue as reviewed by CODM	254,119	160,290	492,056	392,430
Segment gross profit as reviewed by CODM	57,210	26,217	110,131	59,722
Adjusted EBITDA	27,893	6,589	52,946	15,825
Residential, Light Commercial
Segment Reporting Information [Line Items]
Total segment revenue as reviewed by CODM	48,176	50,320	114,439	100,931
Segment gross profit as reviewed by CODM	703	10,708	4,914	9,413
Adjusted EBITDA	(5,568)	5,402	(4,992)	(2,472)
Others
Segment Reporting Information [Line Items]
Total segment revenue as reviewed by CODM	6,628	12,700	8,194	45,559
Segment gross profit as reviewed by CODM	5,280	(6,283)	5,032	(15,738)
Adjusted EBITDA	4,878	(7,177)	4,264	(16,086)
Operating Segments
Segment Reporting Information [Line Items]
Segment gross profit as reviewed by CODM	63,193	30,642	120,077	53,397
Adjusted EBITDA	27,203	4,814	52,218	(2,733)
Intersegment revenue
Segment Reporting Information [Line Items]
Segment gross profit as reviewed by CODM	419	(3,193)	868	9,851
Intersegment revenue | Residential, Light Commercial
Segment Reporting Information [Line Items]
Total segment revenue as reviewed by CODM	0	0	0	0
Intersegment revenue | Residential, Light Commercial
Segment Reporting Information [Line Items]
Total segment revenue as reviewed by CODM	0	0	0	0
Intersegment revenue | Others
Segment Reporting Information [Line Items]
Total segment revenue as reviewed by CODM	0	5,643	(11)	25,522
Dev Co | Operating Segments | Residential, Light Commercial
Segment Reporting Information [Line Items]
Total segment revenue as reviewed by CODM	247,260	154,126	478,682	380,756
Dev Co | Operating Segments | Residential, Light Commercial
Segment Reporting Information [Line Items]
Total segment revenue as reviewed by CODM	44,769	47,006	102,890	93,754
Dev Co | Operating Segments | Others
Segment Reporting Information [Line Items]
Total segment revenue as reviewed by CODM	5,374	(204)	6,340	266
Power Co | Operating Segments | Residential, Light Commercial
Segment Reporting Information [Line Items]
Total segment revenue as reviewed by CODM	6,859	6,164	13,374	11,674
Power Co | Operating Segments | Residential, Light Commercial
Segment Reporting Information [Line Items]
Total segment revenue as reviewed by CODM	3,407	3,314	11,549	7,177
Power Co | Operating Segments | Others
Segment Reporting Information [Line Items]
Total segment revenue as reviewed by CODM	$ 1,254	$ 7,261	$ 1,865	$ 19,771