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Restaurant Closure Costs and Impairment of Long-Lived Assets (Narrative) (Details) - item
1 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Minimum [Member]    
Restructuring Cost and Reserve [Line Items]    
Number of restaurants expected to be closed 55  
Maximum [Member]    
Restructuring Cost and Reserve [Line Items]    
Number of restaurants expected to be closed 65  
Chipotle [Member]    
Restructuring Cost and Reserve [Line Items]    
Number of restaurants expected to be closed   48
Number of restaurants closed   45
Pizzeria Locale [Member]    
Restructuring Cost and Reserve [Line Items]    
Number of restaurants expected to be closed   5
Number of restaurants closed   5
TastyMade [Member]    
Restructuring Cost and Reserve [Line Items]    
Number of restaurants closed   1