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EQUITY INVESTMENTS - Income Statement Summary (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Jan. 01, 2023
Jan. 02, 2022
Schedule of Equity Method Investments [Line Items]      
Revenue [1] $ 1,123,110 $ 1,060,113 $ 783,279
Gross profit (loss) 78,115 (47,948) (29,014)
Loss from operations (219,205) (200,294) (172,447)
Net loss (275,711) (267,146) (255,746)
Net loss attributable to Huansheng JV (2,811) (9,072) (16,480)
Huansheng Photovoltaic (Jiangsu) Co., Ltd.      
Schedule of Equity Method Investments [Line Items]      
Revenue 1,637,862 1,619,358 1,018,731
Gross profit (loss) 1,433 (40,099) 25,204
Loss from operations (135,799) (177,283) (27,427)
Net loss (136,433) (159,888) (126,338)
Huansheng Photovoltaic (Jiangsu) Co., Ltd.      
Schedule of Equity Method Investments [Line Items]      
Net loss attributable to Huansheng JV $ (33,708) $ (62,820) $ (95,939)
[1] We have related-party transactions with TCL Zhonghuan Renewable Energy Technology Co. Ltd, SunPower and TotalEnergies S.E. and its affiliates as well as unconsolidated entities in which we have a direct equity investment. These related-party transactions are recorded within the “Revenue,” “Cost of revenue,” “Operating expenses: Research and development and Sales, general and administrative,” and “Other expense, net: Interest expense” financial statement line items in our Consolidated Statements of Operations (see Note 3, Note 4 and Note 10).