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Reverse Recapitalization (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Jul. 31, 2023 | Dec. 29, 2024 | Sep. 28, 2025
Reverse Recapitalization [Line Items] |  |  |  |
Net cash proceeds |  | $ 19.7 |  |
Common shares issued (in Shares) | 49,065,361 |  | 73,784,645 | 89,167,963
Common shares outstanding (in Shares) | 49,065,361 |  | 73,784,645 | 89,167,963
Cash payments | $ 5.4 |  |  |
Legacy Complete Solaria [Member] |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |
Professional fees |  |  | $ 16.4 |
Additional paid-in capital |  |  | $ 5.8 |
Class A Common Stock [Member] | Merger [Member] |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |
Common shares issued (in Shares) |  |  | 45,290,553 |
Common shares outstanding (in Shares) |  |  | 45,290,553 |
FACT [Member] |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |
Additional paid-in capital |  |  | $ 10.6 |
Previously Reported [Member] |  |  |  |
Reverse Recapitalization [Line Items] |  |  |  |
Additional paid-in capital |  |  | $ 16.4 |

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