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SEGMENT AND GEOGRAPHICAL INFORMATION - Revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Jan. 01, 2023
Jan. 02, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from contracts with customers [1] $ 1,123,110 $ 1,060,113 $ 783,279
Related party      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues from related parties 206,000 283,300 225,900
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from contracts with customers 645,112 427,111 227,499
France      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from contracts with customers 70,388 80,872 88,454
Italy      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from contracts with customers 139,506 126,195 83,957
Rest of world      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenue from contracts with customers $ 268,104 $ 425,935 $ 383,369
[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).