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Borrowings and Derivative Liabilities - Schedule of Contingent Interest Payable (Details) - USD ($) $ in Thousands | Sep. 28, 2025 | Dec. 29, 2024
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Schedule of Contingent Interest Payable [Line Items] |  |
Total contingent interest payable | $ 2,359 | $ 2,830
Contingent interest payable [Member] |  |
Schedule of Contingent Interest Payable [Line Items] |  |
Total contingent interest payable | 2,359 | 1,255
Contingent interest payable – related parties [Member] |  |
Schedule of Contingent Interest Payable [Line Items] |  |
Total contingent interest payable |  | $ 1,575

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- Definition Amount of contingent interest payable. + References No definition available. + Details
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Namespace Prefix: | spwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=spwr_ContingentInterestPayableRelatedPartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |