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Restaurant Information by Ownership Type (Details) - Restaurant
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]    
Number of Restaurants 37,406 37,011
Franchised    
Segment Reporting Information [Line Items]    
Number of Restaurants 34,521 31,936
Franchised | Conventional franchised    
Segment Reporting Information [Line Items]    
Number of Restaurants 21,535 21,317
Franchised | Developmental licensed    
Segment Reporting Information [Line Items]    
Number of Restaurants 7,013 7,263
Franchised | Affiliated    
Segment Reporting Information [Line Items]    
Number of Restaurants 5,973 3,356
Company-operated    
Segment Reporting Information [Line Items]    
Number of Restaurants 2,885 5,075