Organization and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Oct. 03, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles of Consolidation	Principles of Consolidation The accompanying unaudited 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 unaudited 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 and nine months ended October 3, 2021 are not necessarily indicative of the results that may be expected for fiscal year 2021, or for any other future period.
Fiscal Periods	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 third quarter of fiscal 2021 ended on October 3, 2021, while the third quarter of fiscal 2020 ended on September 27, 2020.
Management Estimates	Management Estimates The preparation of the unaudited 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 unaudited condensed consolidated financial statements and accompanying notes. Significant estimates in these unaudited condensed consolidated financial statements include revenue recognition, specifically 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 warranty and litigation; 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.
Recently Adopted Accounting Pronouncements and Recent Accounting Pronouncements Not Yet Adopted	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 was 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.