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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