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BUSINESS DESCRIPTION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Self-Insurance Accruals, Deferred Rent and Rent Expense, Shipping and Handling Costs (Details)
$ in Millions
12 Months Ended
Jun. 30, 2018
USD ($)
renewal_period
item
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Self-Insurance Accruals      
Decrease in self-insurance expense due to change in estimates related to prior year open policy periods $ 1.2 $ 1.6 $ 1.0
Number of times the entity updates loss projections each year | item 4    
Self-insurance accruals, current $ 10.3 12.4  
Self-insurance accruals, noncurrent $ 25.8 26.1  
Deferred Rent and Rent Expense      
Number of renewal periods | renewal_period 1    
Shipping and Handling      
Shipping and Handling Costs:      
Costs of goods sold $ 6.1 $ 3.7 $ 3.6