SHARE-BASED COMPENSATION PLANS - Outstanding Preferred Stock Activity (Details) - Series A and Series A-1 Preferred Stock $ / shares in Units, shares in Millions	12 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares
Shares
Outstanding, beginning of period (in shares) | shares	5.0
Granted (in shares) | shares	7.9
Forfeited (in shares) | shares	(3.5)
Outstanding, end of period (in shares) | shares	9.4
Vested and expected to vest (in shares) | shares	8.9
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 23.62
Granted (in dollars per share) | $ / shares	9.46
Forfeited (in dollars per share) | $ / shares	24.28
Outstanding, end of period (in dollars per share) | $ / shares	11.47
Vested and expected to vest (in dollars per share) | $ / shares	$ 10.91
Aggregate Intrinsic Value and Weighted Average Remaining Contractual Term
Vested and expected to vest, aggregate intrinsic value | $	$ 22.20
Vested and expected to vest, weighted average remaining contractual term	6 years 3 months