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Leases - Real estate costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2020
Dec. 31, 2019
Lease costs    
Operating lease $ 58,425 $ 54,844
Variable lease 1,479 1,590
Short-term lease 90 120
Total lease costs $ 59,994 $ 56,554