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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Taxes [Line Items] |  |  |
U.S. federal statutory rate | 21.00% | 24.50% | 35.00%
Amount of foreign tax credit carryforwards | $ 20.1 |  |
Amount of foreign net operating loss carryforwards | 16.9 |  |
Amount of state net operating loss carryforwards | 0.5 |  |
Equity compensation | 4.1 |  |
Accrued interest and penalties related to unrecognized tax benefits | 2.1 | $ 2.2 |
Unrecognized tax benefits related to discontinued operations | 15.3 | $ 14.3 |
Domestic |  |  |
Income Taxes [Line Items] |  |  |
Amount of net operating loss carryforwards | 8.9 |  |
State |  |  |
Income Taxes [Line Items] |  |  |
Amount of net operating loss carryforwards | 14.5 |  |
Foreign |  |  |
Income Taxes [Line Items] |  |  |
Amount of net operating loss carryforwards | 62.0 |  |
Tax credit carryforwards | 24.9 |  |
Foreign minimum tax credit carryforwards | $ 1.9 |  |

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