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Accounts Receivable and Contract Assets, Net (Narrative) (Details) - USD ($) $ in Thousands | Sep. 26, 2025 | Dec. 27, 2024 | Dec. 29, 2023
--- | --- | --- | ---
Receivables [Line Items] |  |  |
Contract assets (unbilled revenue) | $ 26,184 | $ 23,530 | $ 17,500
Accounts receivable | 33,539 | 35,926 | $ 35,600
Software Development [Member] |  |  |
Receivables [Line Items] |  |  |
Unbilled accounts receivable | $ 10,300 | $ 7,800 |

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