Equity Investments - Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 28, 2020	Jun. 28, 2020	Jun. 30, 2019	Dec. 29, 2019
Schedule of Equity Method Investments [Line Items]
Equity investments with readily determinable fair value	$ 249,152	$ 249,152		$ 173,908
Equity investments without readily determinable fair value:	7,481	7,481		8,661
Equity investments with fair value option	9,776	9,776		17,500
Equity method investments	292,235	292,235		226,602
Proceeds from return of capital		46,149	$ 0
Enphase Energy, Inc.
Schedule of Equity Method Investments [Line Items]
Equity investments with readily determinable fair value	249,152	249,152		173,908
Project entities
Schedule of Equity Method Investments [Line Items]
Equity investments without readily determinable fair value:	2,802	2,802		2,802
Other Equity Investments Without Readily Determinable Fair Value
Schedule of Equity Method Investments [Line Items]
Equity investments without readily determinable fair value:	4,679	4,679		5,859
Proceeds from return of capital	0	2,500
Equity securities gain	0	1,300
SunStrong Capital Holdings
Schedule of Equity Method Investments [Line Items]
Equity investments with fair value option	7,500	7,500		8,000
Proceeds from return of capital	500
SunStrong Partners
Schedule of Equity Method Investments [Line Items]
Equity investments with fair value option	2,276	2,276		9,500
Proceeds from return of capital	7,200
Total equity investment with fair value option
Schedule of Equity Method Investments [Line Items]
Equity investments with fair value option	9,776	9,776		17,500
Proceeds from return of capital	7,700
Huansheng Photovoltaic (Jiangsu) Co., Ltd.
Schedule of Equity Method Investments [Line Items]
Equity method investments	25,826	25,826		26,533
Total equity method investments
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 25,826	$ 25,826		$ 26,533