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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Income Taxes [Line Items] |  |  |
U.S. federal statutory rate | 21.00% | 21.00% | 21.00%
Amount of foreign tax credit carryforwards | $ 9.3 |  |
Amount of foreign net operating loss carryforwards | 9.5 |  |
Equity compensation | 5.4 |  |
Accrued interest and penalties related to unrecognized tax benefits | 2.9 | $ 2.8 |
Unrecognized tax benefits related to discontinued operations | 1.4 | $ 13.0 |
Domestic |  |  |
Income Taxes [Line Items] |  |  |
Amount of net operating loss carryforwards | 7.3 |  |
Domestic | Research Tax Credit Carryforward |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carryforwards | 1.0 |  |
State |  |  |
Income Taxes [Line Items] |  |  |
Amount of net operating loss carryforwards | 56.2 |  |
Foreign |  |  |
Income Taxes [Line Items] |  |  |
Amount of net operating loss carryforwards | 32.0 |  |
Tax credit carryforwards | 10.6 |  |
Foreign minimum tax credit carryforwards | 1.4 |  |
Foreign | Research Tax Credit Carryforward |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carryforwards | $ 0.3 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 + Details
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