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COMMITMENTS AND CONTINGENCIES - Repurchase Agreements (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2017
USD ($)
item
Jun. 30, 2016
USD ($)
item
Repurchase agreements    
Inventory repurchase contingent obligation $ 1,008 $ 742
Obligation to Repurchase Inventory    
Repurchase agreements    
Maximum repurchase obligation under aggregated floor plan agreements $ 94,046 $ 88,810
Number of units repurchased | item 0 0
Inventory repurchase contingent obligation $ 1,008 $ 742
Obligation to Repurchase Inventory | Minimum    
Repurchase agreements    
Inventory repurchase contingent obligation period 18 months  
Obligation to Repurchase Inventory | Maximum    
Repurchase agreements    
Inventory repurchase contingent obligation period 30 months