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Fair Value Measurements - Schedule of Financial Assets and Liabilities that are Measured at Fair Value, on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 29, 2026 | Dec. 28, 2025 | Dec. 29, 2024
--- | --- | --- | ---
Financial Assets |  |  |  |  |  |  |
Financial assets |  | $ 1,134 |  | $ 3,841 |  | $ 3,841 |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 110,044 |  | 132,089 |  | 102,561 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Assets |  |  |  |  |  |  |
Financial assets |  | 1,134 |  | 3,841 |  | 3,841 |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 2,070 |  | 13,315 |  | 862 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Assets |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Assets |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 107,974 |  | 118,774 |  | 101,699 |
Restricted cash [Member] |  |  |  |  |  |  |
Financial Assets |  |  |  |  |  |  |
Financial assets |  | 1,134 |  | 3,841 |  | 3,841 |
Restricted cash [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Assets |  |  |  |  |  |  |
Financial assets |  | 1,134 |  | 3,841 |  | 3,841 |
Restricted cash [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Assets |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |
Restricted cash [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Assets |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |
July 2024 Notes derivative liability [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 14,042 | [1] | 19,604 | [1],[2] | 13,563 | [2]
July 2024 Notes derivative liability [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  | [1] |  | [1],[2] |  | [2]
July 2024 Notes derivative liability [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  | [1] |  | [1],[2] |  | [2]
July 2024 Notes derivative liability [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 14,042 | [1] | 19,604 | [1],[2] | 13,563 | [2]
July 2024 Notes derivative liability – related parties [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 9,036 | [1] | 12,615 | [1],[2] | 21,127 | [2]
July 2024 Notes derivative liability – related parties [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  | [1] |  | [1],[2] |  | [2]
July 2024 Notes derivative liability – related parties [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  | [1] |  | [1],[2] |  | [2]
July 2024 Notes derivative liability – related parties [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 9,036 | [1] | 12,615 | [1],[2] | 21,127 | [2]
September 2024 Notes derivative liability [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 26,351 | [1] | 37,930 | [1],[2] | 55,474 | [2]
September 2024 Notes derivative liability [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  | [1] |  | [1],[2] |  | [2]
September 2024 Notes derivative liability [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  | [1] |  | [1],[2] |  | [2]
September 2024 Notes derivative liability [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 26,351 | [1] | 37,930 | [1],[2] | 55,474 | [2]
September 2024 Notes derivative liability – related parties [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 4,286 | [1] | 5,870 | [1],[2] | 6,958 | [2]
September 2024 Notes derivative liability – related parties [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  | [1] |  | [1],[2] |  | [2]
September 2024 Notes derivative liability – related parties [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  | [1] |  | [1],[2] |  | [2]
September 2024 Notes derivative liability – related parties [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 4,286 | [1] | 5,870 | [1],[2] | 6,958 | [2]
July 2025 Note derivative liability– related party [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities | [1] | 2,239 |  | 3,246 | [2] |  |
July 2025 Note derivative liability– related party [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities | [1] |  |  |  | [2] |  |
July 2025 Note derivative liability– related party [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities | [1] |  |  |  | [2] |  |
July 2025 Note derivative liability– related party [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities | [1] | 2,239 |  | 3,246 | [2] |  |
September 2025 Notes derivative liability [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities | [1],[2] |  |  | 14,756 |  |  |
September 2025 Notes derivative liability [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities | [1],[2] |  |  |  |  |  |
September 2025 Notes derivative liability [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities | [1],[2] |  |  |  |  |  |
September 2025 Notes derivative liability [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities | [1],[2] |  |  | 14,756 |  |  |
November 2025 Note derivative liability – related party [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities | [1],[2] |  |  | 1,488 |  |  |
November 2025 Note derivative liability – related party [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities | [1],[2] |  |  |  |  |  |
November 2025 Note derivative liability – related party [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities | [1],[2] |  |  |  |  |  |
November 2025 Note derivative liability – related party [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities | [1],[2] |  |  | 1,488 |  |  |
Forward purchase agreement liabilities [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 5,107 |  | 3,965 |  | 3,494 | [3]
Forward purchase agreement liabilities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  | [3]
Forward purchase agreement liabilities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  | [3]
Forward purchase agreement liabilities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 5,107 |  | 3,965 |  | 3,494 | [3]
SAFE Agreement with related party [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 579 |  | 535 |  | 384 |
SAFE Agreement with related party [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |
SAFE Agreement with related party [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |
SAFE Agreement with related party [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 579 |  | 535 |  | 384 |
Private placement warrants [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 1,504 |  | 1,692 |  | 627 |
Private placement warrants [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |
Private placement warrants [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |
Private placement warrants [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 1,504 |  | 1,692 |  | 627 |
Working capital warrants [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 172 |  | 194 |  | 72 |
Working capital warrants [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |
Working capital warrants [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |
Working capital warrants [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 172 |  | 194 |  | 72 |
Public warrants [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 2,070 |  | 2,475 |  | 862 |
Public warrants [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 2,070 |  | 2,475 |  | 862 |
Public warrants [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |
Public warrants [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |
Deferred Sunder Consideration Shares [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 6,331 |  | 10,840 |  |  |
Deferred Sunder Consideration Shares [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  | 10,840 |  |  |
Deferred Sunder Consideration Shares [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |
Deferred Sunder Consideration Shares [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 6,331 |  |  |  |  |
Deferred Ambia Consideration Shares [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | 13,936 |  | 16,879 |  |  |
Deferred Ambia Consideration Shares [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |
Deferred Ambia Consideration Shares [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |
Deferred Ambia Consideration Shares [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |
Financial liabilities |  | $ 13,936 |  | $ 16,879 |  |  |
[1] | The derivative liabilities are associated with the Company’s outstanding senior unsecured convertible notes with stated interest rates of 7.0% (the “September 2024 Notes” and “September 2025 Notes”) and 12.0% (the “July 2024 Notes”, “July 2025 Note”, “November 2025 Note” and “January 2026 Note”) all of which are defined in Note 9 – Borrowings and Derivative Liabilities.
[2] | The derivative liabilities are associated with the Company’s outstanding senior unsecured convertible notes with stated interest rates of 7.0% (the “September 2024 Notes” and “September 2025 Notes”) and 12.0% (the “July 2024 Notes”, “July 2025 Note”, and “November 2025 Note”) all of which are defined in Note 10 – Borrowings and Derivative Liabilities.
[3] | Includes $1.3 million due to related parties as of and December 29, 2024.

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