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INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance | $ 309.2 | $ 323.4 |  |
Deferred Tax Assets, Valuation Allowance | (96.5) | (87.7) |  |
Convertible debt investments | 43.6 | 33.4 |  |
Foreign tax credit carryovers | 15.2 | 16.3 |  |
Deferred tax assets subject to limitation | 9.9 | 10.5 |  |
Statutory tax benefit of net operating loss carryovers and related valuation allowances | 9.7 | 10.2 |  |
Net operating loss carryovers | 56.4 | 67.3 |  |
Gross unrecognized tax benefits | 25.7 | 34.6 | $ 35.8 | $ 24.1
Unrecognized tax benefits that would have an impact on the effective tax rate | 23.1 | 31.1 | 31.5 |
Unrecognized tax benefits accrued payment of interest | 5.8 | 3.9 | 3.2 |
Unrecognized tax benefits accrued payment of penalties | 1.1 | 1.3 | $ 1.6 |
Other assets |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance | 191.3 | 189.8 |  |
Other liabilities |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred Tax Liabilities, Net | 7.0 | 1.1 |  |
Foreign Country |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred Tax Assets, Valuation Allowance | (4.6) | (6.4) |  |
Foreign tax credit carryovers | 15.2 | 16.3 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 6.8 | 8.3 |  |
U.S. state and local tax authorities |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred Tax Assets, Valuation Allowance | (7.0) | (6.9) |  |
State tax credit carryovers | 1.0 | 1.4 |  |
Valuation allowance for state credits | 0.8 | 1.3 |  |
State net operating losses carryforward | $ 19.1 | 15.2 |  |
State net operating losses carryforward period, minimum | 5 years |  |  |
Valuation allowance related to other state items | $ 2.6 | 2.2 |  |
Domestic Tax Authority |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Net operating loss carryovers | 20.6 |  |  |
Foreign Tax Jurisdiction, Other |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred Tax Assets, Valuation Allowance | $ (13.0) | $ (11.0) |  |

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