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Commitments and Contingencies (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2020
USD ($)
Oct. 31, 2019
USD ($)
Oct. 31, 2017
vineyard
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]                
Base rent expense (less than)       $ 0.1 $ 0.1 $ 0.1 $ 0.2  
Base rent expense related to lease liability (less than)           0.1    
Cash paid for operating lease liabilities (less than)           0.2 $ 0.2  
Natural Disasters and Other Casualty Events                
Loss Contingencies [Line Items]                
Number of vineyards impacted by wildfires (in vineyards) | vineyard     2          
Insurance proceeds $ 0.1 $ 0.2           $ 1.1
Inventory losses       $ 0.5   $ 0.5    
Natural Disasters and Other Casualty Events | Cost of Sales                
Loss Contingencies [Line Items]                
Insurance proceeds               0.6
Natural Disasters and Other Casualty Events | Other Income, Net                
Loss Contingencies [Line Items]                
Insurance proceeds               $ 0.5