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Consolidated Statements of Operations and Comprehensive Loss (Parentheticals) - USD ($)	12 Months Ended
	Dec. 28, 2025	Dec. 29, 2024
Income Statement [Abstract]
Revenue and commission expense attributable to related party	$ 1,000	$ 1,600
Related party interest expense and amortization of debt issuance costs	$ 5,700	$ 7,600

X

- Definition

Related party interest expense and amortization of debt issuance costs.

+ References

No definition available.

+ Details

Name:	spwr_RelatedPartyInterestExpenseAndAmortizationOfDebtIssuanceCosts
Namespace Prefix:	spwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of revenue and commission expense attributable to related party.

+ References

No definition available.

+ Details

Name:	spwr_RevenueAndCommissionExpenseAttributableToRelatedParty
Namespace Prefix:	spwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeStatementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration