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SUPPLEMENTAL FINANCIAL STATEMENT DATA - Accounts Receivable - Components (Details) - USD ($) $ in Thousands | Dec. 30, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 27, 2019
--- | --- | --- | --- | ---
Accounts Receivable, after Allowance for Credit Loss |  |  |  |
Billed | $ 60,842 | $ 68,325 |  |
Unbilled | 74,546 | 54,817 |  |
Contract retentions | 8,515 | 4,472 |  |
Other assets | 9,583 | 12,630 |  |
Accounts receivable, before allowance for credit loss | 153,486 | 140,244 |  |
Allowance for doubtful accounts | (640) | (1,115) | $ (2,127) | $ (1,147)
Accounts receivable, after allowance for credit loss | $ 152,846 | $ 139,129 |  |

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