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INCOME TAXES - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Income Taxes      
Net tax expense, valuation allowance against NOLs generated in 2018 $ 14.7    
Additional valuation allowance 17.0    
Expected tax refund 1.4    
Tax credit carryforward amount subject to expiration 37.1    
Undistributed earnings of international subsidiaries 30.3    
Reserve on unrecognized tax benefits that would benefit the effective tax rate 1.3    
Interest and penalties 0.1 $ 0.1 $ 0.1
Accrued interest and penalties related to unrecognized tax benefits 1.1    
Capital loss carryforward      
Income Taxes      
Valuation allowance 14.9    
Tax credit carryforward amount subject to expiration 14.9    
Domestic Tax Authority      
Income Taxes      
Operating loss carryforwards 43.6    
Operating loss carryforwards, subject to expiration 27.3    
Operating loss carryforwards, not subject to expiration 16.3    
State and Local Jurisdiction      
Income Taxes      
Operating loss carryforwards 16.7    
Operating loss carryforwards, subject to expiration 15.7    
Operating loss carryforwards, not subject to expiration 1.0    
Foreign Tax Authority | Canada      
Income Taxes      
Operating loss carryforwards 3.8    
Foreign Tax Authority | U.K.      
Income Taxes      
Operating loss carryforwards $ 0.3