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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Leases    
Amortization of right-of-use assets $ 2,342 $ 815
Interest on lease liabilities 606 251
Operating lease cost 40,026 42,487
Short-term lease cost 3,960 2,704
Variable lease cost 6,503 9,558
Total lease costs 53,437 55,815
Sublease income (10,407) (10,879)
Total lease costs, net of sublease income $ 43,030 $ 44,936