INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Income Taxes
Operating loss carryforwards, subject to expiration	$ 12.3
Operating loss carryforwards, not subject to expiration	90.6
Tax credit carryforward amount subject to expiration	37.6
Undistributed earnings of international subsidiaries	2.1
Reserve on unrecognized tax benefits that would benefit the effective tax rate	0.7
Interest and penalties	0.1	$ 0.1	$ 0.2
Accrued interest and penalties related to unrecognized tax benefits	0.6
Capital loss carryforward
Income Taxes
Tax credit carryforward amount subject to expiration	5.9
Domestic Tax Authority
Income Taxes
Operating loss carryforwards	102.9
Uncertain tax positions	17.6
State and Local Jurisdiction
Income Taxes
Operating loss carryforwards	27.1
Operating loss carryforwards, subject to expiration	23.5
Operating loss carryforwards, not subject to expiration	3.6
Uncertain tax positions	2.6
Foreign Tax Authority | Canada
Income Taxes
Operating loss carryforwards	8.5
Foreign Tax Authority | U.K.
Income Taxes
Operating loss carryforwards	$ 0.2