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INCOME TAXES - Additional Information (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Statutory income tax rate | 21.00% | 21.00% | 21.00% |
Valuation allowance for net operating losses | $ 40.7 | $ 32.3 |  |
Foreign tax credit carryovers | 15.0 | 14.9 |  |
Deferred tax assets subject to limitation | 10.7 | 10.8 |  |
Gross unrecognized tax benefits | 35.8 | 24.1 | $ 30.2 | $ 29.5
Unrecognized tax benefits that would have an impact on the effective tax rate | 31.5 | 19.9 | 25.9 |
Unrecognized tax benefits accrued payment of interest | 3.2 | 2.7 | 2.8 |
Unrecognized tax benefits accrued payment of penalties | $ 1.6 | 1.6 | 1.6 |
Discrete item, foreign income tax, increase (decrease) in basis points | 340 |  |  |
Discrete item, increase (decrease) in basis points | 260 |  |  |
Deferred Tax Assets, Net of Valuation Allowance | $ 298.0 | 163.7 |  |
Deferred Tax Liabilities, Net |  | (47.8) |  |
Impairment, restructuring and other | 693.1 | 4.3 | 0.8 |
Income Tax Expense (Benefit) | 120.6 | (159.8) | (123.7) |
Operating expenses | Goodwill and intangible asset impairments |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Impairment, restructuring and other | 668.3 | 0.0 | 0.0 |
Impairment, Restructuring, And Other |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Income Tax Expense (Benefit) | 148.3 |  |  |
Goodwill, Non-Deductible Impact | 18.8 |  |  |
Other assets |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance | 143.5 |  |  |
Other liabilities |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Deferred Tax Liabilities, Net | (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 | 10.5 |  |  |
Foreign Country |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Valuation allowance for net operating losses | 2.9 |  |  |
Foreign net operating losses | 3.7 | 1.8 |  |
Foreign tax credit carryovers | 15.0 | 14.9 |  |
U.S. state and local tax authorities |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Valuation allowance for net operating losses | 4.8 |  |  |
Foreign tax credit carryovers | 1.4 | 1.4 |  |
State net operating losses carryforward | $ 7.3 | 1.7 |  |
State net operating losses carryforward period, minimum | 5 years |  |  |
State net operating losses carryforward period, maximum | 20 years |  |  |
Valuation allowance for state credits | $ 1.2 |  |  |
Discontinued Operations |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Gross unrecognized tax benefits | 0.2 | $ 0.2 | $ 6.4 |
State Administration of Taxation, China | Foreign Country |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Valuation allowance for net operating losses | $ 6.3 |  |  |

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