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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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