Cover - shares	9 Months Ended
	Sep. 28, 2025	Dec. 18, 2025
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Amendment Flag	false
Document Period End Date	Sep. 28, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q3
Entity Information [Line Items]
Entity Registrant Name	SUNPOWER INC.
Entity Central Index Key	0001838987
Entity File Number	001-40117
Entity Tax Identification Number	93-2279786
Entity Incorporation, State or Country Code	DE
Current Fiscal Year End Date	--12-29
Entity Current Reporting Status	No
Entity Shell Company	false
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Incorporation, Date of Incorporation	Feb. 22, 2010
Entity Contact Personnel [Line Items]
Entity Address, Address Line One	45700 Northport Loop East
Entity Address, City or Town	Fremont
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94538
Entity Phone Fax Numbers [Line Items]
City Area Code	(510)
Local Phone Number	270-2507
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		107,621,272
Common stock, par value $0.0001 per share
Entity Listings [Line Items]
Title of 12(b) Security	Common stock, par value $0.0001 per share
Trading Symbol	SPWR
Security Exchange Name	NASDAQ
Redeemable warrants, each whole warrant exercisable for one share of common stock
Entity Listings [Line Items]
Title of 12(b) Security	Redeemable warrants, each whole warrant exercisable for one share of common stock
Trading Symbol	SPWRW
Security Exchange Name	NASDAQ