LEASE COMMITMENTS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Operating Leased Assets [Line Items]
Rent expense	$ 208.2	$ 166.1	$ 82.5
Payments collected from sub-lessors	6.2	6.0	5.4
Selling, general and administrative
Operating Leased Assets [Line Items]
Estimated net future minimum lease (recoveries) payments and related costs for facilities no longer used	$ 8.6	$ 9.2	$ 0.0
Minimum
Operating Leased Assets [Line Items]
Operating leases renewal term	1 year
Maximum
Operating Leased Assets [Line Items]
Operating leases renewal term	10 years