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Accrued Expenses - Summary of Accrued Contract Termination Costs (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Accrued Liabilities And Other Liabilities [Abstract]    
Accrued contract termination costs—beginning balance   $ 392
Contract termination costs incurred $ 3,231 3,449
Contract termination costs settled and paid $ (3,231) $ (3,841)