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Non-controlling Interest - Narrative (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Non-controlling LLC Unit holders ownership in Malibu Boats Holdings, LLC      
Noncontrolling Interest [Line Items]      
Tax distributions payable to non-controlling LLC Unit holders $ 446   $ 568
Tax distributions paid to non-controlling LLC Unit holders $ 969 $ 909  
Class A Common Stock      
Noncontrolling Interest [Line Items]      
Issuance LLC Units (in shares) 129,946    
Treasury Stock, Common      
Noncontrolling Interest [Line Items]      
Treasury stock, shares, retired (in shares) 15,733    
Repurchase Agreements      
Noncontrolling Interest [Line Items]      
Treasury stock, shares, retired (in shares) 383,404