INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Income Taxes
Valuation allowance	$ 34.4
Net tax expense, valuation allowance against NOLs		$ 14.7
Additional valuation allowance	34.4	17.0
Tax credit carryforward amount subject to expiration	37.4
Undistributed earnings of international subsidiaries	11.1
Reserve on unrecognized tax benefits that would benefit the effective tax rate	0.9
Interest and penalties	0.1	0.1	$ 0.1
Accrued interest and penalties related to unrecognized tax benefits	0.9
Capital loss carryforward
Income Taxes
Valuation allowance		$ 14.9
Tax credit carryforward amount subject to expiration	14.2
Domestic Tax Authority
Income Taxes
Operating loss carryforwards	112.3
Operating loss carryforwards, subject to expiration	27.3
Operating loss carryforwards, not subject to expiration	85.0
State and Local Jurisdiction
Income Taxes
Operating loss carryforwards	26.9
Operating loss carryforwards, subject to expiration	23.5
Operating loss carryforwards, not subject to expiration	3.4
Foreign Tax Authority | Canada
Income Taxes
Operating loss carryforwards	6.1
Foreign Tax Authority | U.K.
Income Taxes
Operating loss carryforwards	$ 0.5