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SUPPLEMENTAL BALANCE SHEET INFORMATION - Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
Jun. 27, 2021
Dec. 27, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Prepaid software agreements $ 7,658 $ 8,643
Other prepaid expenses 7,320 8,631
Other current assets 9,461 8,863
Prepaid expenses and other current assets $ 24,439 $ 26,137