Organization And Summary Of Significant Accounting Policies	3 Months Ended
	Apr. 04, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization And Summary Of Significant Accounting Policies	ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization SunPower Corporation (together with its subsidiaries, "SunPower," the “Company,” "we," "us," or "our") is a leading solar technology and energy services provider that delivers complete solar solutions to customers primarily in the United States and Canada through an array of hardware, software, and financing options and "Smart Energy" solutions. Our Smart Energy initiative is designed to add layers of intelligent control to homes, buildings, and grids—all personalized through easy-to-use customer interfaces. We are a leader in the U.S. Distributed Generation (“DG”) storage and energy services market, providing customers control over electricity consumption and resiliency during power outages while providing cost savings to homeowners, businesses, governments, schools, and utilities through multiple offerings. Our sales channels include a strong network of dealers and resellers that operate in both residential and commercial markets. SunPower is a majority-owned subsidiary of Total Solar INTL SAS ("Total," formerly Total Solar International SAS) and Total Gaz Electricité Holdings France SAS (“Total Gaz”), each a subsidiary of Total SE (“Total SE,” formerly Total SA) (see “Note 2. Transactions with Total and Total SE). On August 26, 2020, we completed the spin-off (the “Spin-Off”) of Maxeon Solar Technologies, Ltd., a Singapore public company limited by shares (“Maxeon Solar”), consisting of certain non-U.S. operations and assets of our former SunPower Technologies business unit. As a result of the Spin-Off, we no longer consolidate Maxeon Solar within our financial results of continuing operations. For all the periods prior to the Spin-Off, the financial results of Maxeon Solar are presented as net earnings from discontinued operations on the condensed consolidated statements of operations. Liquidity We believe that our total cash and cash equivalents will be sufficient to meet our obligations over the next 12 months from the date of issuance of our financial statements, including repayment of our 0.875% senior convertible debentures due June 1, 2021 (the "0.875% debentures due 2021"), of which an aggregate principal amount of $62.5 million was outstanding as of April 4, 2021. In addition, we have historically been successful in our ability to divest certain investments, including our investment in shares of Enphase Inc., and non-core assets, secure other sources of financing, such as accessing the capital markets, and implement other cost reduction initiatives such as restructuring, to address our liquidity needs. Although we have historically been able to generate liquidity, we cannot predict, with certainty, the outcome of our actions to generate liquidity as planned. Basis of Presentation and Preparation Principles of Consolidation The accompanying condensed consolidated financial statements have been prepared by us in accordance with generally accepted accounting principles in the United States ("United States" or "U.S.," and such accounting principles, "U.S. GAAP") for interim financial information, and include the accounts of SunPower, all of our subsidiaries and special purpose entities, as appropriate under U.S. GAAP. All intercompany transactions and balances have been eliminated in consolidation. The financial information included herein is unaudited, and reflects all adjustments which are, in the opinion of our management, of a normal recurring nature and necessary for a fair statement of the results for the periods presented. The January 3, 2021 consolidated balance sheet data was derived from SunPower’s audited consolidated financial statements included in our Annual Report on Form 10-K for the fiscal year ended January 3, 2021, as filed with the Securities and Exchange Commission ("SEC") on February 22, 2021, but does not include all disclosures required by U.S. GAAP. The condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in SunPower's Annual Report on Form 10-K for the fiscal year ended January 3, 2021. The operating results for the three months ended April 4, 2021 are not necessarily indicative of the results that may be expected for fiscal year 2021, or for any other future period. We have a 52-to-53-week fiscal year that ends on the Sunday closest to December 31. Accordingly, every fifth or sixth year will be a 53-week fiscal year. The current fiscal year, fiscal 2021, is a 52-week fiscal year, while fiscal year 2020 was a 53-week fiscal year. The first quarter of fiscal 2021 ended on April 4, 2021, while the first quarter of fiscal 2020 ended on March 29, 2020. Management Estimates The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires our management to make estimates and assumptions that affect the amounts reported in these condensed consolidated financial statements and accompanying notes. Significant estimates in these condensed consolidated financial statements include revenue recognition, specifically the nature and timing of satisfaction of performance obligations, standalone selling price of performance obligations, and variable consideration; credit losses, including estimating macroeconomic factors affecting historical recovery rate of receivables; inventory and project asset write-downs; long-lived asset impairment, specifically estimates for valuation assumptions including discount rates and future cash flows; fair value of investments, including equity investments for which we apply the fair value option and other financial instruments; valuation of contingencies such as accrued warranty; the incremental borrowing rate used in discounting of lease liabilities; the fair value of indemnities provided to customers and other parties; and income taxes and tax valuation allowances. Actual results could materially differ from those estimates. Summary of Selected Significant Accounting Policies Refer to our Annual Report on Form 10-K for the fiscal year ended January 3, 2021 for the full list of our significant accounting policies. Recently Adopted Accounting Pronouncements In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes, which simplifies the accounting for income taxes, eliminates certain exceptions within ASC 740, Income Taxes, and clarifies certain aspects of the current guidance to promote consistency among reporting entities. Most amendments within the standard are required to be applied on a prospective basis, while certain amendments must be applied on a retrospective or modified retrospective basis. We adopted the ASU during the first quarter of fiscal 2021. The adoption did not have a material impact on our consolidated financial statements. In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848): Scope. The ASU is an update to ASU 2020-04 issued by the FASB in March 2020 and is intended to clarify the scope of ASC 848 to include derivatives that are affected by a change in the interest rate used for margining, discounting, or contract price alignment that do not also reference LIBOR or another reference rate expected to be discontinued as a result of reference rate reform. This guidance is effective immediately upon issuance on January 7, 2021. We adopted the ASU during the first quarter of fiscal 2021. The adoption did not have any impact on our consolidated financial statements and related disclosures. Recent Accounting Pronouncements Not Yet Adopted In August 2020, the FASB issued ASU 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40)—Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity. The amendment reduces the number of accounting models used for convertible debt instruments and convertible preferred stock, which results in fewer embedded conversion features separately recognized from the host contracts. ASU 2020-06 is effective no later than the first quarter of fiscal 2022. Early adoption is permitted no earlier than the first quarter of fiscal 2021, and the ASU should be applied retrospectively. We are currently evaluating the impacts of the provisions of ASU 2020-06 on our financial statements and disclosures.