The Company and Summary of Significant Accounting Policies	6 Months Ended
Jun. 28, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
The Company and Summary of Significant Accounting Policies	THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES The Company SunPower Corporation (together with its subsidiaries, the "Company" or "SunPower") is a vertically integrated solar energy products and solutions company that designs, manufactures and delivers high-performance solar systems worldwide, serving as a one-stop shop for residential, commercial and utility-scale power plant customers. SunPower Corporation is a majority owned subsidiary of Total Energies Nouvelles Activités USA ("Total"), a subsidiary of Total S.A. ("Total S.A.") (see Note 2). In the first quarter of fiscal 2015, in connection with a realignment of its internal organizational structure, the Company changed its segment reporting from its Americas, EMEA and APAC Segments to three end-customer segments: (i) Residential Segment, (ii) Commercial Segment and (iii) Power Plant Segment. The Residential and Commercial Segments combined are referred to as Distributed Generation. Historically, the Americas Segment included both North and South America, the EMEA Segment included European countries as well as the Middle East and Africa, and the APAC Segment included all Asia-Pacific countries. Under the new segmentation, the Company’s Residential Segment refers to sales of solar energy solutions to residential end customers through a variety of means, including cash sales and long-term leases directly to end customers, sales to resellers, including the Company's third-party global dealer network, and sales of the Company's operations and maintenance (“O&M”) services. The Company’s Commercial Segment refers to sales of solar energy solutions to commercial and public entity end customers through a variety of means, including direct sales of turn-key engineering, procurement and construction ("EPC") services, sales to the Company's third-party global dealer network, sales of energy under power purchase agreements ("PPAs"), and sales of the Company's O&M services. The Power Plant Segment refers to the Company's large-scale solar products and systems business, which includes power plant project development and project sales, EPC services for power plant construction, power plant O&M services and component sales for power plants developed by third parties, sometimes on a multi-year, firm commitment basis. The Company’s President and Chief Executive Officer, as the chief operating decision maker (“CODM”), reviews the Company's business and manages resource allocations and measures performance of the Company’s activities among these three end-customer segments. Reclassifications of prior period segment information have been made to conform to the current period presentation. This change does not affect the Company's previously reported Consolidated Financial Statements. Basis of Presentation and Preparation Principles of Consolidation The consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States of America ("United States" or "U.S.") and include the accounts of the Company, all of its subsidiaries and special purpose entities, as appropriate under consolidation accounting guidelines. Intercompany transactions and balances have been eliminated in consolidation. The assets of the special purpose entities that the Company establishes in connection with certain project financing arrangements for customers are not designed to be available to service the general liabilities and obligations of the Company. Reclassifications Certain prior period balances, including prior period segment information, have been reclassified to conform to the current period presentation in the Company's consolidated financial statements and the accompanying notes. Such reclassifications had no effect on previously reported results of operations or accumulated deficit. Fiscal Years The Company has 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 2015, is a 53-week fiscal year and includes a 14-week fourth fiscal quarter, while fiscal year 2014 was a 52-week fiscal year. The second quarter of fiscal 2015 ended on June 28, 2015, while the second quarter of fiscal 2014 ended on June 29, 2014. The second quarters of fiscal 2015 and fiscal 2014 were both 13-week quarters. Management Estimates The preparation of the consolidated financial statements in conformity with U.S. generally accepted accounting principles ("U.S. GAAP") requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Significant estimates in these consolidated financial statements include percentage-of-completion for construction projects; allowances for doubtful accounts receivable and sales returns; inventory and project asset write-downs; stock-based compensation; estimates for future cash flows and economic useful lives of property, plant and equipment, goodwill, valuations for business combinations, other intangible assets and other long-term assets; the fair value and residual value of leased solar power systems; fair value of financial instruments; valuation of contingencies and certain accrued liabilities such as accrued warranty; and income taxes and tax valuation allowances. Actual results could materially differ from those estimates. Recent Accounting Pronouncements In July 2015, the Financial Accounting Standards Board ("FASB") issued an update to the standards to simplify the measurement of inventory. The updated standard more closely aligns the measurement of inventory with that of International Financial Reporting Standards (“IFRS”) and amends the measurement standard from lower of cost or market to lower of cost or net realizable value. The new guidance is effective for the Company no later than the first quarter of fiscal 2017 and requires a prospective approach to adoption. Early adoption is permitted. The Company is evaluating the potential impact of this standard on its consolidated financial statements and disclosures. In April 2015, the FASB issued an update to the standards to provide a practical expedient for the measurement date of defined benefit obligation and plan assets for reporting entities with fiscal year-ends that do not coincide with a month-end. The updated standard allows such entities to measure defined benefit plan assets and obligations using the month-end that is closest to the entity's fiscal year-end and apply that practical expedient consistently from year to year and to all plans, if an entity has more than one plan. The new practical expedient guidance is effective for the Company no later than the first quarter of fiscal 2016 and requires a prospective approach to adoption. Early adoption is permitted. The Company is evaluating the potential impact of this standard on its consolidated financial statements and disclosures. In April 2015, the FASB issued an update to the standards for the presentation of debt issuance costs to reduce complexity in accounting standards and to align with IFRS. The updated standard requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability. U.S. generally accepted accounting principles previously required debt issuance costs to be reflected as an asset on the Company's balance sheet. The new debt issuance cost guidance is effective for the Company no later than the first quarter of fiscal 2016 and requires a retrospective approach to adoption. The Company elected early adoption of the updated accounting standard, effective in the first quarter of fiscal 2015, resulting in a one-time reclassification of $11.6M of debt issuance costs from "Other long-term assets" to "Long-term debt" and "Convertible debt, net of current portion" in the Consolidated Balance Sheets as of December 28, 2014. In February 2015, the FASB issued a new standard that modifies existing consolidation guidance for reporting organizations that are required to evaluate whether they should consolidate certain legal entities. The new consolidation guidance is effective for the Company in the first quarter of fiscal 2016 and requires either a retrospective or a modified retrospective approach to adoption. Early adoption is permitted. The Company is evaluating the available methods and the potential impact of this standard on its consolidated financial statements and disclosures. In May 2014, the FASB issued a new revenue recognition standard based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. The new revenue recognition standard becomes effective for the Company in the first quarter of fiscal 2018 and is to be applied retrospectively using one of two prescribed methods. Early adoption is permitted. The Company is evaluating the available methods and the potential impact of this standard on its consolidated financial statements and disclosures. Other than as described above, there has been no issued accounting guidance not yet adopted by the Company that it believes is material or potentially material to its consolidated financial statements.

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

The Company

SunPower Corporation (together with its subsidiaries, the "Company" or "SunPower") is a vertically integrated solar energy products and solutions company that designs, manufactures and delivers high-performance solar systems worldwide, serving as a one-stop shop for residential, commercial and utility-scale power plant customers. SunPower Corporation is a majority owned subsidiary of Total Energies Nouvelles Activités USA ("Total"), a subsidiary of Total S.A. ("Total S.A.") (see Note 2).

In the first quarter of fiscal 2015, in connection with a realignment of its internal organizational structure, the Company changed its segment reporting from its Americas, EMEA and APAC Segments to three end-customer segments: (i) Residential Segment, (ii) Commercial Segment and (iii) Power Plant Segment. The Residential and Commercial Segments combined are referred to as Distributed Generation. Historically, the Americas Segment included both North and South America, the EMEA Segment included European countries as well as the Middle East and Africa, and the APAC Segment included all Asia-Pacific countries.

Under the new segmentation, the Company’s Residential Segment refers to sales of solar energy solutions to residential end customers through a variety of means, including cash sales and long-term leases directly to end customers, sales to resellers, including the Company's third-party global dealer network, and sales of the Company's operations and maintenance (“O&M”) services. The Company’s Commercial Segment refers to sales of solar energy solutions to commercial and public entity end customers through a variety of means, including direct sales of turn-key engineering, procurement and construction ("EPC") services, sales to the Company's third-party global dealer network, sales of energy under power purchase agreements ("PPAs"), and sales of the Company's O&M services. The Power Plant Segment refers to the Company's large-scale solar products and systems business, which includes power plant project development and project sales, EPC services for power plant construction, power plant O&M services and component sales for power plants developed by third parties, sometimes on a multi-year, firm commitment basis.

The Company’s President and Chief Executive Officer, as the chief operating decision maker (“CODM”), reviews the Company's business and manages resource allocations and measures performance of the Company’s activities among these three end-customer segments.

Reclassifications of prior period segment information have been made to conform to the current period presentation. This change does not affect the Company's previously reported Consolidated Financial Statements.

Basis of Presentation and Preparation

Principles of Consolidation

The consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States of America ("United States" or "U.S.") and include the accounts of the Company, all of its subsidiaries and special purpose entities, as appropriate under consolidation accounting guidelines. Intercompany transactions and balances have been eliminated in consolidation. The assets of the special purpose entities that the Company establishes in connection with certain project financing arrangements for customers are not designed to be available to service the general liabilities and obligations of the Company.

Reclassifications

Certain prior period balances, including prior period segment information, have been reclassified to conform to the current period presentation in the Company's consolidated financial statements and the accompanying notes. Such reclassifications had no effect on previously reported results of operations or accumulated deficit.

Fiscal Years

The Company has 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 2015, is a 53-week fiscal year and includes a 14-week fourth fiscal quarter, while fiscal year 2014 was a 52-week fiscal year. The second quarter of fiscal 2015 ended on June 28, 2015, while the second quarter of fiscal 2014 ended on June 29, 2014. The second quarters of fiscal 2015 and fiscal 2014 were both 13-week quarters.

Management Estimates

The preparation of the consolidated financial statements in conformity with U.S. generally accepted accounting principles ("U.S. GAAP") requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Significant estimates in these consolidated financial statements include percentage-of-completion for construction projects; allowances for doubtful accounts receivable and sales returns; inventory and project asset write-downs; stock-based compensation; estimates for future cash flows and economic useful lives of property, plant and equipment, goodwill, valuations for business combinations, other intangible assets and other long-term assets; the fair value and residual value of leased solar power systems; fair value of financial instruments; valuation of contingencies and certain accrued liabilities such as accrued warranty; and income taxes and tax valuation allowances. Actual results could materially differ from those estimates.

Recent Accounting Pronouncements

In July 2015, the Financial Accounting Standards Board ("FASB") issued an update to the standards to simplify the measurement of inventory. The updated standard more closely aligns the measurement of inventory with that of International Financial Reporting Standards (“IFRS”) and amends the measurement standard from lower of cost or market to lower of cost or net realizable value. The new guidance is effective for the Company no later than the first quarter of fiscal 2017 and requires a prospective approach to adoption. Early adoption is permitted. The Company is evaluating the potential impact of this standard on its consolidated financial statements and disclosures.

In April 2015, the FASB issued an update to the standards to provide a practical expedient for the measurement date of defined benefit obligation and plan assets for reporting entities with fiscal year-ends that do not coincide with a month-end. The updated standard allows such entities to measure defined benefit plan assets and obligations using the month-end that is closest to the entity's fiscal year-end and apply that practical expedient consistently from year to year and to all plans, if an entity has more than one plan. The new practical expedient guidance is effective for the Company no later than the first quarter of fiscal 2016 and requires a prospective approach to adoption. Early adoption is permitted. The Company is evaluating the potential impact of this standard on its consolidated financial statements and disclosures.

In April 2015, the FASB issued an update to the standards for the presentation of debt issuance costs to reduce complexity in accounting standards and to align with IFRS. The updated standard requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability. U.S. generally accepted accounting principles previously required debt issuance costs to be reflected as an asset on the Company's balance sheet. The new debt issuance cost guidance is effective for the Company no later than the first quarter of fiscal 2016 and requires a retrospective approach to adoption. The Company elected early adoption of the updated accounting standard, effective in the first quarter of fiscal 2015, resulting in a one-time reclassification of $11.6M of debt issuance costs from "Other long-term assets" to "Long-term debt" and "Convertible debt, net of current portion" in the Consolidated Balance Sheets as of December 28, 2014.

In February 2015, the FASB issued a new standard that modifies existing consolidation guidance for reporting organizations that are required to evaluate whether they should consolidate certain legal entities. The new consolidation guidance is effective for the Company in the first quarter of fiscal 2016 and requires either a retrospective or a modified retrospective approach to adoption. Early adoption is permitted. The Company is evaluating the available methods and the potential impact of this standard on its consolidated financial statements and disclosures.

In May 2014, the FASB issued a new revenue recognition standard based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. The new revenue recognition standard becomes effective for the Company in the first quarter of fiscal 2018 and is to be applied retrospectively using one of two prescribed methods. Early adoption is permitted. The Company is evaluating the available methods and the potential impact of this standard on its consolidated financial statements and disclosures.

Other than as described above, there has been no issued accounting guidance not yet adopted by the Company that it believes is material or potentially material to its consolidated financial statements.