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INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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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 |  |

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