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Leases - Rent expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 26, 2018
Jun. 26, 2018
Jun. 25, 2019
Leases      
Rent expense $ 13,518 $ 26,929  
Term (in years)     1 year
Minimum      
Leases      
Term (in years)     10 years
Lease renewal term     1 year
Maximum      
Leases      
Term (in years)     15 years
Lease renewal term     5 years
Occupancy      
Leases      
Minimum rent 11,836 23,369  
Contingent rent 283 601  
Rent expense 12,119 23,970  
Equipment and other      
Leases      
Minimum rent $ 1,399 $ 2,959