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Organization, Basis of Presentation, and Summary of Significant Accounting Policies Dealer Rebates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dealer Rebate Accrual [Roll Forward]    
Balance at beginning of year $ 3,912 $ 3,165
Add: Additions to dealer rebate incentive provision 12,960 6,440
Less: Dealer rebates paid (13,694) (5,693)
Balance at end of year $ 3,178 $ 3,912