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Business Combinations - Schedule of Provisional Fair Values of Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Mar. 29, 2026 | Dec. 28, 2025 | Dec. 29, 2024
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Cobalt Power Systems, Inc. [Member] |  |  |  |
Net assets acquired: |  |  |  |
Consideration transferred |  | $ 9,664 |  |
Cobalt Power Systems, Inc. [Member] | Customer relationships [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total |  | 18 years |  |
Cobalt Power Systems, Inc. [Member] | Trade name [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total |  | 10 years |  |
Cobalt Power Systems, Inc. [Member] | Building lease intangible asset – favorable lease [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total |  | 6 years |  |
Sunder Energy LLC [Member] |  |  |  |
Net assets acquired: |  |  |  |
Cash and cash equivalents |  | $ 1,350 |  |
Accounts receivable |  | 1,368 |  |
Prepaid expenses and other current assets |  | 797 |  |
Property and equipment, net |  | 2,230 |  |
Intangible assets |  | 4,300 |  |
Operating lease right-of-use assets |  | 2,563 |  |
Accounts payable |  | (2,806) |  |
Accrued expenses and other current liabilities |  | (2,917) |  |
Contract liabilities |  | (1,675) |  |
Fair value of net assets acquired |  | 2,564 |  |
Fair value of common stock issued |  | 16,493 |  |
Fair value of Deferred Ambia Consideration Shares (Accrued expenses and other current liabilities) |  | 16,879 |  |
Consideration transferred |  | 33,372 | $ 57,789 | $ 33,372
Goodwill recognized |  | 30,808 |  |
Total |  | 37,500 |  |
Net assets acquired: |  |  |  |
Contract assets - unbilled receivables |  | 1,143 |  |
Operating lease liabilities, noncurrent |  | (2,702) |  |
Finance lease liabilities |  | (1,269) |  |
Net assets acquired: |  |  |  |
Other noncurrent assets |  | 182 |  |
Sunder Energy LLC [Member] | Customer relationships [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total |  | 30,600 |  |
Sunder Energy LLC [Member] | Trademarks - Ambia [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total |  | 6,100 |  |
Sunder Energy LLC [Member] | Developed technology - Sunder [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total |  | 800 |  |
Provisional Fair Values [Member] | Cobalt Power Systems, Inc. [Member] |  |  |  |
Net assets acquired: |  |  |  |
Cash and cash equivalents |  | 553 |  |
Accounts receivable |  | 3,642 |  |
Inventories |  | 1,739 |  |
Prepaid expenses and other current assets |  | 30 |  |
Property and equipment, net |  | 485 |  |
Intangible assets |  | 3,871 |  |
Operating lease right-of-use assets |  | 1,277 |  |
Accounts payable |  | (3,864) |  |
Accrued expenses and other current liabilities |  | (1,002) |  |
Short-term debt with third parties |  | (2,706) |  |
Other long-term liabilities |  | (1,099) |  |
Contract liabilities |  | (5,238) |  |
Deferred tax liability |  | (1,001) |  |
Fair value of net assets acquired |  | (3,313) |  |
Fair value of common stock issued |  | 3,333 |  |
Fair value of Deferred Ambia Consideration Shares (Accrued expenses and other current liabilities) |  | 6,331 |  |
Consideration transferred |  | 9,664 |  |
Goodwill recognized |  | 12,977 |  |
Total |  | 3,871 |  |
Provisional Fair Values [Member] | Cobalt Power Systems, Inc. [Member] | Customer relationships [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total |  | 1,100 |  |
Provisional Fair Values [Member] | Cobalt Power Systems, Inc. [Member] | Trade name [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total |  | 2,000 |  |
Provisional Fair Values [Member] | Cobalt Power Systems, Inc. [Member] | Building lease intangible asset – favorable lease [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total |  | 771 |  |
Provisional Fair Values [Member] | Sunder Energy LLC [Member] |  |  |  |
Net assets acquired: |  |  |  |
Accounts receivable |  | 797 |  |
Prepaid expenses and other current assets |  | 3,039 |  |
Property and equipment, net |  | 241 |  |
Intangible assets |  | 37,500 |  |
Operating lease right-of-use assets |  | 313 |  |
Accounts payable |  | (203) |  |
Accrued expenses and other current liabilities |  | (3,850) |  |
Contract liabilities |  | (11,673) |  |
Fair value of net assets acquired |  | 25,967 |  |
Consideration transferred |  | 57,789 |  |
Goodwill recognized |  | 31,822 |  |
Net assets acquired: |  |  |  |
Other noncurrent assets |  | 135 |  |
Operating lease liabilities |  | $ (332) |  |
Provisional Fair Values [Member] | Sunder Energy LLC [Member] | Customer relationships [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total | [1] | 1 year |  |
Provisional Fair Values [Member] | Sunder Energy LLC [Member] | Trademarks - Ambia [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total |  | 1 year |  |
Measurement Period Adjustments [Member] | Sunder Energy LLC [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total |  | $ 4,300 |  |
Measurement Period Adjustments [Member] | Sunder Energy LLC [Member] | Customer relationships [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total |  | $ 3,400 |  |
Total |  | 10 years |  |
Measurement Period Adjustments [Member] | Sunder Energy LLC [Member] | Trademarks - Ambia [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total |  | $ 900 |  |
Total |  | 10 years |  |
Measurement Period Adjustments [Member] | Sunder Energy LLC [Member] | Developed technology - Sunder [Member] |  |  |  |
Net assets acquired: |  |  |  |
Total |  | 2 years |  |
[1] | Useful life is based upon customer consumption, expected to occur within one year.

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