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INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Statutory income tax rate | 21.00% | 21.00% | 21.00% |
Valuation allowance for net operating losses | $ 32.3 | $ 33.8 |  |
Foreign tax credit carryovers | 14.9 | 17.2 |  |
Deferred tax assets subject to limitation | 10.8 | 10.8 |  |
Gross unrecognized tax benefits | 24.1 | 30.2 | $ 29.5 | $ 13.9
Unrecognized tax benefits that would have an impact on the effective tax rate | 19.9 | 25.9 | 25.2 |
Unrecognized tax benefits accrued payment of interest | 2.7 | 2.8 | 2.1 |
Unrecognized tax benefits accrued payment of penalties | 1.6 | 1.6 | 0.4 |
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 | 1.7 |  |  |
Foreign net operating losses | 1.8 |  |  |
Foreign tax credit carryovers | 14.9 | 17.2 |  |
U.S. state and local tax authorities |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Valuation allowance for net operating losses | 1.3 |  |  |
State net operating losses carryforward | $ 1.7 |  |  |
State net operating losses carryforward period, minimum | 5 years |  |  |
State net operating losses carryforward period, maximum | 20 years |  |  |
Tax benefits associated with state tax credits | $ 1.4 | 1.4 |  |
Valuation allowance for state credits | 1.2 |  |  |
Discontinued Operations |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Gross unrecognized tax benefits | 0.2 | $ 6.4 | $ 6.7 |
State Administration of Taxation, China | Foreign Country |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |
Valuation allowance for net operating losses | $ 2.6 |  |  |

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