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COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES Loss Contingencies (Details)
$ in Millions
3 Months Ended 12 Months Ended 15 Months Ended
Sep. 26, 2018
USD ($)
Jun. 27, 2018
USD ($)
Jun. 26, 2019
USD ($)
LegalMatter
Jun. 27, 2018
USD ($)
Jun. 28, 2017
USD ($)
Jun. 26, 2019
USD ($)
LegalMatter
Loss Contingencies [Line Items]            
Cyber security incident charges $ 0.4 $ 2.0 $ 0.4 $ 2.0 $ 0.0  
Number of matters pending or threatened which are expected to have a material adverse effect | LegalMatter     0     0
Cyber security incident [Member]            
Loss Contingencies [Line Items]            
Cyber insurance coverage deductible     $ 2.0      
Cyber security incident charges           $ 4.2
Receivable due from insurance     1.8     1.8
Loss contingency, estimate of possible loss     $ 5.0     $ 5.0