REVENUE AND CONTRACT COSTS (Contract Costs) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Jun. 30, 2018	Jun. 30, 2019
Minimum
Contract Costs
Amortization period	1 year
Maximum
Contract Costs
Amortization period	18 years
Selling, general and administrative expenses
Contract Costs
Amortization of deferred contract costs	$ 1.7	$ 2.1
Other current assets
Contract Costs
Short-term unamortized contract costs	5.6		$ 5.7
Other assets
Contract Costs
Long term unamortized contract costs	$ 4.5		$ 3.8