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SUPPLEMENTAL FINANCIAL STATEMENT DATA - Accured Liabilities (Details) - USD ($)
$ in Thousands
Dec. 27, 2019
Dec. 28, 2018
ACCRUED LIABILITIES    
Accrued subcontractor costs $ 45,366 $ 21,446
Accrued bonuses 7,756 5,273
Other 4,630 2,489
Compensation and payroll taxes 3,286 2,544
Employee withholdings 3,463 2,137
Paid leave bank 3,114 3,512
Total accrued liabilities $ 67,615 $ 37,401