Equity Investments - Equity Method Investments (Details) - USD ($) $ in Thousands	Jul. 04, 2021	Jan. 03, 2021
Schedule of Equity Method Investments [Line Items]
Equity investments with readily determinable fair value	$ 279,618	$ 614,148
Equity investments without readily determinable fair value:	801	801
Equity investments with fair value option	8,374	9,924
Total equity investments	661,613	624,873
Enphase Energy, Inc.
Schedule of Equity Method Investments [Line Items]
Equity investments with readily determinable fair value	$ 652,438	614,148
Owned shares, reclassified to current assets (in shares)	2,000,000
Project entities
Schedule of Equity Method Investments [Line Items]
Equity investments without readily determinable fair value:	$ 122	122
Other equity investments without readily determinable fair value
Schedule of Equity Method Investments [Line Items]
Equity investments without readily determinable fair value:	679	679
SunStrong Capital Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Equity investments with fair value option	8,371	7,645
SunStrong Partners, LLC
Schedule of Equity Method Investments [Line Items]
Equity investments with fair value option	3	2,279
Total equity investment with fair value option
Schedule of Equity Method Investments [Line Items]
Equity investments with fair value option	$ 8,374	$ 9,924