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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Property, Plant and Equipment        
Restricted cash $ 2,628 $ 0 $ 0  
Cost of goods sold 99,205 85,630    
Selling expenses 37,310 32,856    
Coffee Brewing Equipment        
Property, Plant and Equipment        
Cost of goods sold 8,500 6,600    
Interest Expense [Member] | Accounting Standards Update 2017-07        
Property, Plant and Equipment        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 1,600 1,600 6,600 $ 6,400
Other Expense [Member] | Accounting Standards Update 2017-07        
Property, Plant and Equipment        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (1,800) (1,700) $ (6,700) $ (6,800)
Shipping and Handling [Member]        
Property, Plant and Equipment        
Selling expenses $ 3,100 $ 1,900