Segment and Geographical Information - Reconciliation of Segment Gross Profit to Condensed Consolidated GAAP Gross Profit (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]
Gross profit	$ 61,031	$ 25,652	$ 110,905	$ 54,836
Construction revenue on solar services contracts	308,927	217,667	615,325	508,213
Stock-based compensation expense			15,050	12,746
Operating Segments
Segment Reporting Information [Line Items]
Gross profit	63,193	30,642	120,077	53,397
Intersegment revenue
Segment Reporting Information [Line Items]
Gross profit	419	(3,193)	868	9,851
Construction revenue on solar services contracts	0	(5,643)	11	(25,522)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Legacy utility and power plant projects	0	0	0	207
Construction revenue on solar services contracts	0	0	0	(5,392)
Results of operations of legacy business to be exited	4	0	625	0
Segment Reconciling Items \| Gross Profit
Segment Reporting Information [Line Items]
Legacy utility and power plant projects	0	0	0	34
Legacy sale-leaseback transactions	0	0	0	(20)
Gain on sale and impairment of residential lease assets	519	458	1,013	906
Construction revenue on solar services contracts	0	0	0	(4,734)
Stock-based compensation expense	(1,069)	(471)	(1,956)	(1,030)
Amortization of intangible assets	0	(1,784)	0	(3,568)
Results of operations of legacy business to be exited	$ (2,031)	$ 0	$ (9,097)	$ 0

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