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Refranchising Initiative Refranchising Initiative (Narrative) (Details) - franchise
 3 Months Ended 12 Months Ended
Nov. 30, 2016
Aug. 31, 2016
Jun. 30, 2016
Franchisor Disclosure [Line Items]      
Franchise restaurant ownership target     95.00%
Refranchised Company Drive-Ins 56 38  
Non-controlling operating interest [Member]      
Franchisor Disclosure [Line Items]      
Refranchised Company Drive-Ins   25