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Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Floor Financing (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Floor Financing Accrual [Roll Forward]      
Balance at beginning of year $ 117 $ 104 $ 0
Add: Flooring expense 5,813 4,288 3,407
Additions for Cobalt acquisition 132 0 0
Less: Flooring paid (5,851) (4,275) (3,303)
Balance at end of year $ 211 $ 117 $ 104