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INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance | $ 323.4 | $ 298.0 |  |
Deferred Tax Assets, Valuation Allowance | (87.7) | (40.7) |  |
Convertible debt investments | 33.4 | 25.3 |  |
Foreign tax credit carryovers | 16.3 | 15.0 |  |
Deferred tax assets subject to limitation | 10.5 | 10.7 |  |
Net operating loss carryovers | 67.3 | 21.7 |  |
Gross unrecognized tax benefits | 34.6 | 35.8 | $ 24.1 | $ 30.2
Unrecognized tax benefits that would have an impact on the effective tax rate | 31.1 | 31.5 | 19.9 |
Unrecognized tax benefits accrued payment of interest | 3.9 | 3.2 | 2.7 |
Unrecognized tax benefits accrued payment of penalties | 1.3 | 1.6 | $ 1.6 |
Other assets |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance | 189.8 | 143.5 |  |
Other liabilities |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred Tax Liabilities, Net | 1.1 | 8.5 |  |
AeroGrow International Inc. |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Statutory tax benefit of net operating loss carryovers and related valuation allowances | 10.2 |  |  |
Foreign Country |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred Tax Assets, Valuation Allowance | (6.4) |  |  |
Foreign tax credit carryovers | 16.3 | 15.0 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 8.3 | 3.7 |  |
U.S. state and local tax authorities |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred Tax Assets, Valuation Allowance | (6.9) |  |  |
Foreign tax credit carryovers | 1.4 | 1.4 |  |
Valuation allowance for state credits | 1.3 |  |  |
State net operating losses carryforward | $ 15.2 | $ 7.3 |  |
State net operating losses carryforward period, minimum | 5 years |  |  |
State net operating losses carryforward period, maximum | 20 years |  |  |
Valuation allowance related to other state items | $ 2.2 |  |  |
Domestic Tax Authority |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Net operating loss carryovers | 33.3 |  |  |
State Administration of Taxation, China | Foreign Country |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred Tax Assets, Valuation Allowance | $ (11.0) |  |  |

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