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Stockholder's Equity (Details)
 12 Months Ended
Aug. 14, 2017
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
unit_holder
vote
$ / shares
shares
Jun. 30, 2018
USD ($)
unit_holder
$ / shares
shares
Jun. 30, 2017
USD ($)
unit_holder
shares
Jun. 18, 2019
USD ($)
Jul. 06, 2017
shares
Class of Stock [Line Items]            
Capital stock, shares authorized (in shares)   150,000,000        
Preferred stock, shares authorized (in shares)   25,000,000 25,000,000      
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01      
Proceeds from issuance of common stock | $ $ 58,075,000          
Proceeds from issuance of common stock net of discounts and commissions | $ 55,317,000 $ 0 $ 55,317,000 $ 0    
Underwriting discounts and commissions | $ 2,758,000          
Amount of debt prepayment | $ $ 50,000,000 $ 35,000,000 $ 50,000,000 $ 72,000,000    
Number of unit holders | unit_holder   5 11 4    
Number of votes | vote   1        
Common stock, conversion basis   1        
Number of LLC units outstanding (in shares)   21,682,792.000 21,598,534.000      
Ownership percentage   100.00% 100.00%      
Class A Common Stock            
Class of Stock [Line Items]            
Common stock, shares authorized (in shares)   100,000,000 100,000,000      
Common stock, shares issued (in shares) 2,300,000 20,852,640 20,555,348     39,262,000
Share price (in dollars per share) | $ / shares $ 24.05          
Number of shares issued and sold 300,000          
Common stock, shares, outstanding (in shares)   20,852,640 20,555,348      
Stock repurchase program, authorized amount | $         $ 35,000,000  
Class B Common Stock            
Class of Stock [Line Items]            
Common stock, shares authorized (in shares)   25,000,000 25,000,000      
Common stock, shares issued (in shares)   15 17      
Treasury stock, shares, retired (in shares)   2 1 1    
Common stock, shares, outstanding (in shares)   15 17 19    
Malibu Boats, Inc. ownership in Malibu Boats Holdings, LLC            
Class of Stock [Line Items]            
Number of LLC units outstanding (in shares)   20,852,640 20,555,348      
Ownership percentage   96.20% 95.20%      
Non-controlling Interest in LLC            
Class of Stock [Line Items]            
Number of LLC units outstanding (in shares)   830,152 1,043,186      
Ownership percentage   3.80% 4.80%