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Commitment and Contingencies - Narrative (Details)
 12 Months Ended
May 27, 2017
USD ($)
May 02, 2017
USD ($)
Aug. 26, 2016
USD ($)
Jun. 30, 2018
USD ($)
unit
Option
Jun. 30, 2017
USD ($)
unit
Jun. 30, 2016
USD ($)
unit
dealer
Dec. 15, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]              
Floor financing, repurchase obligations       $ 163,626,000 $ 107,923,000    
Number of repurchase units | unit       0 0 3  
Number of repurchase dealers | dealer           2  
Unit repurchase loss           $ 30,000  
Monthly lease payments       $ 156,000      
Lease, number of options | Option       3      
Sale leaseback transaction, lease terms       10 years      
Operating leases, rental expense       $ 2,568,000 $ 2,384,000 2,394,000  
Amount awarded from other party   $ 2,500,000          
Damages sought, value     $ 5,000,000     $ 3,268,000  
Amended litigation settlement             $ 1,938,000
Litigation settlement, amount agreed to be paid $ 2,175,000            
Loss contingency accrual         $ 0