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Other Expense, Net - Schedule of Other Expense, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 28, 2025 | Sep. 29, 2024 | Sep. 28, 2025 | Sep. 29, 2024 | Dec. 31, 2024 | Dec. 29, 2024 | Dec. 31, 2023
Schedule of Other Expense Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on issuance of derivative liabilities |  |  | [1] | $ (24,688) | [1] |  | [1] | $ (24,688) | [1] | $ (24,688) | [2] | $ (24,688) | [3] |  | [2],[3]
Change in fair value of derivative liabilities | [4] | (2,034) |  | (37,875) |  | 1,639 |  | (37,875) |  |  |  |  |  |  |
Change in fair value of forward purchase agreement liabilities | [5] | (2,420) |  | 7,728 |  | (807) |  | 4,906 |  |  |  |  |  |  |
Change in fair value of SAFE Agreement with related party |  | (79) |  | (900) |  | (113) |  | (900) |  |  |  | 616 |  |  |
Change in fair value of FACT public, private placement and working capital warrants |  | (78) |  | (6,052) |  | (3,122) |  | (6,295) |  |  |  | (1,258) |  | 6,424 |
Change in fair value of Carlyle Warrants with related party |  |  |  |  |  |  |  | 2,869 |  |  |  |  |  |  |
Change in fair value of redeemable convertible preferred stock warrant liability |  |  |  |  |  |  |  | 1,310 |  |  |  |  |  |  |
Loss on conversion of SAFE Agreements to common stock with related party |  |  |  |  |  |  |  | (1,250) |  |  |  | (1,250) |  |  |
Other financing costs |  |  |  | (3,812) |  |  |  | (3,812) |  | $ (450) |  |  |  |  |
Other, net |  | 355 | [6] | (85) | [6] | 679 | [6] | (499) | [6] |  |  | (221) |  |  |
Total Other Expense, net |  | $ (4,256) | [7] | $ (65,684) | [7] | $ (1,724) | [7] | $ (66,234) | [7] |  |  | $ 7,932 | [8] | $ (29,862) | [8]
[1] | Includes $3.0 million of related party expense in each of the thirteen and thirty-nine week periods ended September 29, 2024.
[2] | Includes $3.0 million loss on a derivative liability issued to the Massey Trust (as later defined in Note 15 - Borrowings and Derivative Liabilities) a related party.
[3] | Includes a loss of $3.0 million on the issuance of a derivative liability with a related party in the fiscal year ended December 29, 2024. Refer to Note 15 - Borrowings and Derivative Liabilities for details.
[4] | Includes a loss of $0.3 million and a gain of $1.8 million due to related parties in the thirteen and thirty-nine week periods ended September 28, 2025, respectively. Includes a loss of $22.8 million due to related parties in each of the thirteen and thirty-nine week periods ended September 29, 2024. Refer to Note 9 – Borrowings and Derivative Liabilities for details.
[5] | Includes a gain of zero and $0.1 million due to related parties for the thirteen and thirty-nine week periods ended September 28, 2025, respectively. Includes a gain from related parties of $2.8 million and $1.8 million due to related parties in the thirteen and thirty-nine week periods ended September 29, 2024, respectively.
[6] | Includes zero and $0.1 million of income due to related parties in the thirteen and thirty-nine week periods ended September 28, 2025, respectively.
[7] | Includes the following related party transactions (in millions):
[8] | Includes related party interest expense and amortization of debt issuance costs of $1.8 million and $1.5 million in the thirteen week periods ended September 28, 2025, and September 29, 2024, respectively. Includes related party interest expense and amortization of debt issuance costs of $5.4 million and $5.6 million in the thirty-nine weeks periods ended September 28, 2025, and September 29, 2024, respectively.

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