SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) $ in Millions	12 Months Ended
	Jun. 30, 2018 USD ($) performance_obligation	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)
Accounting Policies [Abstract]
Revenue recorded from bill and hold inventory	$ 2.4	$ 3.4	$ 3.2
Bill and hold inventory	$ 2.1	$ 2.7
Number of performance obligations | performance_obligation	3