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SUPPLEMENTAL BALANCE SHEET INFORMATION - Accrued wages and benefits (Details) - USD ($)
$ in Thousands
Jun. 27, 2021
Dec. 27, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Deferred employer payroll tax (1) $ 58,230 $ 55,420
Other accrued wages and benefits 78,445 67,237
Accrued wages and benefits $ 136,675 $ 122,657