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EQUITY METHOD INVESTMENT (Narrative) (Details)
$ in Millions
12 Months Ended
Jun. 27, 2018
USD ($)
Jun. 28, 2017
restaurant
Dec. 27, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Note receivable from sale of Mexico JV, gross     $ 18.0
(Gain) on sale of JV $ (0.2)    
Reclassification from AOCL, current period, due to disposition of Mexico JV 5.4    
Reclassification from AOCL, current year, attributable to prior years foreign currency translation losses (5.9)    
Reclassification from AOCL, current period, attributable to current year foreign currency translation gains $ 0.5    
Investment in Mexico JV [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of restaurants to develop | restaurant   50  
Number of restaurants operating in joint venture | restaurant   45