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Fair Value Measurements Narrative (Details)
$ in Millions
3 Months Ended
Sep. 26, 2018
USD ($)
Sep. 27, 2017
USD ($)
restaurant
Jun. 27, 2018
USD ($)
Dec. 27, 2017
USD ($)
Schedule of Impairments [Line Items]        
Carrying Value Of Impaired Long Lived Assets   $ 6.0    
Carrying value of reacquired franchise rights   1.2    
Fair value of impaired long lived assets       $ 0.0
Restaurant impairment charges $ 0.0 7.2    
Goodwill, Impairment Loss 0.0 0.0    
Finite-Lived Intangible Assets, Accumulated Amortization 6.1   $ 5.7  
Liquor Licenses [Member]        
Schedule of Impairments [Line Items]        
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 0.0 $ 0.0    
Chili's Restaurants [Member]        
Schedule of Impairments [Line Items]        
Number Of Underperforming Restaurants | restaurant   9