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POST-RETIREMENT BENEFITS (Details) - 401(k) Retirement Savings Plan - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Monthly employee contributions (as a percent of compensation) 20.00%    
Monthly matching employer contributions (as a percent of compensation) 4.00%    
Selling, General and Administrative Expenses      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan expense $ 9.7 $ 9.2 $ 8.5