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Components of Lease Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2021
Sep. 28, 2020
Sep. 27, 2021
Sep. 28, 2020
Leases [Abstract]        
Operating lease cost $ 2,015 $ 2,333 $ 6,147 $ 7,041
Variable lease cost 193 133 567 376
Short-term lease cost $ 89 $ 84 $ 198 $ 482