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Non-controlling Interest - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Noncontrolling Interest [Line Items]          
Tax distributions payable to non-controlling LLC Unit holders     $ 319 $ 361  
Non-controlling LLC Unit holders ownership in Malibu Boats Holdings, LLC          
Noncontrolling Interest [Line Items]          
Tax distributions payable to non-controlling LLC Unit holders     $ 319   $ 511
Tax distributions paid to non-controlling LLC Unit holders $ 909 $ 602      
Class A Common Stock          
Noncontrolling Interest [Line Items]          
Issuance LLC Units (in shares)     305,288    
Treasury Stock, Common          
Noncontrolling Interest [Line Items]          
Treasury stock, shares, retired (in shares)     24,207