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FAIR VALUE MEASUREMENTS Fair Value Disclosures (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 27, 2017
Dec. 27, 2017
Dec. 28, 2016
Schedule of Impairments [Line Items]      
Impairment of Intangible Assets, Finite-lived     $ 800
Carrying Value Of Impaired Long Lived Assets $ 6,000 $ 2,300 1,200
Carrying value of reacquired franchise rights $ 1,200   800
Restaurant impairment charges     1,000
Fair value of impaired long lived assets   300 200
Goodwill, Impairment Loss   $ 0 $ 0