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INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred tax assets, net of valuation allowance | $ 245.9 | $ 309.2 |  |
Valuation allowance | (96.8) | (96.5) |  |
Convertible debt investments | 4.7 | 43.6 |  |
Outside basis difference in equity investments | 62.7 | 23.1 |  |
Deferred tax assets, valuation allowance, not expected to be utilized | 42.3 | 0.0 |  |
Foreign tax credit carryovers | 13.7 | 15.2 |  |
Deferred tax assets, operating loss carryforwards, subject to limitation | 8.6 | 9.9 |  |
Statutory tax benefit of net operating loss carryovers and related valuation allowances | 8.4 | 9.7 |  |
Net operating loss carryovers | 39.6 | 56.4 |  |
Gross unrecognized tax benefits | 22.8 | 25.7 | $ 34.6 | $ 35.8
Unrecognized tax benefits that would have an impact on the effective tax rate | 21.4 | 23.1 | 31.1 |
Unrecognized tax benefits accrued payment of interest | 6.7 | 5.8 | 3.9 |
Unrecognized tax benefits accrued payment of penalties | 1.1 | 1.1 | $ 1.3 |
Other assets |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred tax assets, net of valuation allowance | 121.1 | 191.3 |  |
Other liabilities |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred tax liabilities, net | 7.6 | 7.0 |  |
Foreign Country |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Valuation allowance | (2.9) | (4.6) |  |
Foreign tax credit carryovers | 13.7 | 15.2 |  |
Deferred tax assets, operating loss carryforwards, foreign | 2.9 | 6.8 |  |
U.S. state and local tax authorities |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Valuation allowance | (7.7) | (7.0) |  |
Deferred tax assets, tax credit carryovers | 1.0 | 1.0 |  |
Valuation allowance for state credits | 0.8 | 0.8 |  |
Deferred tax assets, operating loss carryforward | $ 17.3 | 19.1 |  |
State net operating losses carryforward period, minimum | 5 years |  |  |
Valuation allowance, other state items | $ 2.9 | 2.6 |  |
Domestic Tax Authority |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Net operating loss carryovers | 10.8 |  |  |
Foreign Country, Other |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Valuation allowance | $ (13.4) | $ (13.0) |  |

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