Balance Sheet Components - Property, Plant and Equipment, Net (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 02, 2023	Jul. 03, 2022	Jul. 02, 2023	Jul. 03, 2022	Jan. 01, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 179,187,000		$ 179,187,000		$ 141,105,000
Vehicle finance leases	20,402,000		20,402,000		12,316,000
Less: accumulated depreciation and impairment	(83,472,000)		(83,472,000)		(66,583,000)
Property, plant and equipment, net	95,715,000		95,715,000		74,522,000
Property, plant and equipment, retired			200,000		100,000
Gain (loss) on disposal			0		0
Testing equipment and tools
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,804,000		1,804,000		1,157,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17,368,000		17,368,000		14,342,000
Solar power systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,100,000		11,100,000		10,271,000
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,576,000		15,576,000		14,411,000
Internal-use software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	92,082,000		92,082,000		70,621,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,105,000		8,105,000		8,088,000
Transportation equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,160,000		5,160,000		3,941,000
Work-in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,590,000		7,590,000		$ 5,958,000
Asset Retirement Obligations
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 11,800,000	$ 4,200,000	$ 21,100,000	$ 7,600,000