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Impairment Of Long-Lived Assets And Other Lease Charges (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2020
USD ($)
restaurant
Mar. 29, 2020
Sep. 29, 2019
USD ($)
restaurant
Sep. 27, 2020
USD ($)
Sep. 29, 2019
USD ($)
restaurant
Impaired Long-Lived Assets Held and Used [Line Items]          
Impairment and other lease charges $ 1,954   $ 500 $ 7,776 $ 1,777
Underperforming Restaurants [Member]          
Impaired Long-Lived Assets Held and Used [Line Items]          
Asset impairment charges, number of restaurants 4   2 13 5
Other Lease Charges [Member]          
Impaired Long-Lived Assets Held and Used [Line Items]          
Asset impairment charges, number of restaurants | restaurant 3   1   2
Initial Impairment Charge [Member]          
Impaired Long-Lived Assets Held and Used [Line Items]          
Impairment and other lease charges $ 700   $ 300 $ 4,900 $ 1,100
Capital Expenditures At Underperforming Restaurants [Member]          
Impaired Long-Lived Assets Held and Used [Line Items]          
Impairment and other lease charges 200        
Other Lease Charges [Member]          
Impaired Long-Lived Assets Held and Used [Line Items]          
Impairment and other lease charges     $ 200    
Other Lease Charges [Member] | Underperforming Restaurants [Member]          
Impaired Long-Lived Assets Held and Used [Line Items]          
Impairment and other lease charges $ 1,000     2,400 400
Asset impairment charges, number of restaurants 3 9      
Previously Impairment Restaurants [Member] | Underperforming Restaurants [Member]          
Impaired Long-Lived Assets Held and Used [Line Items]          
Impairment and other lease charges       $ 500 $ 300