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Common Stock and Common Stock Warrants - Schedule of Reserved Shares of Common Stock (Details) - shares	Dec. 28, 2025	Dec. 29, 2024
Schedule of Reserved Shares of Common Stock [Abstract]
Common stock warrants	25,670,265	31,670,265
Employee stock purchase plan	3,174,434	2,628,996
Stock options and RSUs, issued and outstanding	19,164,660	11,979,368
Stock options and RSUs, authorized for future issuance	11,603,508	2,577,895
SAFE Agreement	2,750,000	2,750,000
Forward purchase agreements	6,720,000	6,720,000
Convertible notes	82,460,428	58,579,636
Deferred purchase price consideration	11,640,506
Total shares reserved	163,183,801	116,906,160

X

- Definition

Deferred purchase price consideration.

+ References

No definition available.

+ Details

Name:	spwr_DeferredPurchasePriceConsideration
Namespace Prefix:	spwr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares forward purchase agreements.

+ References

No definition available.

+ Details

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Namespace Prefix:	spwr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of SAFE agreement.

+ References

No definition available.

+ Details

Name:	spwr_SAFEAgreementinDollars
Namespace Prefix:	spwr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents issuance of employee stock purchase plan.

+ References

No definition available.

+ Details

Name:	spwr_StockIssuedDuringEmployeeStockPurchasePlan
Namespace Prefix:	spwr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents stock options restricted stock units authorized for future issuance.

+ References

No definition available.

+ Details

Name:	spwr_StockOptionsAndRestrictedStockUnitsAuthorizedForFutureIssuance
Namespace Prefix:	spwr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Stock options and RSUs, issued and outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	spwr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Aggregate number of nonredeemable convertible preferred shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant