Stockholder's Equity (Details)		12 Months Ended
	Aug. 14, 2017 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) vote unit_holder $ / shares shares	Jun. 30, 2019 USD ($) unit_holder $ / shares shares	Jun. 30, 2018 USD ($) unit_holder shares	Aug. 27, 2020 USD ($)	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	$ 0	$ 55,317,000
Underwriting discounts and commissions | $	2,758,000
Amount of debt prepayment | $	$ 50,000,000
Number of unit holders | unit_holder		4	5	11
Stock repurchased during period | $		$ 13,833,000
Number of votes | vote		1
Common stock, conversion basis		1
Number of LLC units outstanding (in shares)		21,326,621	21,682,792
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	20,595,969	20,852,640				39,262,000
Share price (in dollars per share) | $ / shares	$ 24.05
Number of shares issued and sold (in shares)	300,000
Common stock, shares, outstanding (in shares)		20,595,969	20,852,640
Stock repurchase program, authorized amount | $						$ 35,000,000
Stock repurchased during period (in shares)		483,679	0
Stock repurchased during period | $		$ 13,800,000
Class A Common Stock | Subsequent Event
Class of Stock [Line Items]
Stock repurchase program, authorized amount | $					$ 50,000,000
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	15
Treasury stock, shares, retired (in shares)		0	2	1
Common stock, shares, outstanding (in shares)		15	15	17
Malibu Boats, Inc. ownership in Malibu Boats Holdings, LLC
Class of Stock [Line Items]
Number of LLC units outstanding (in shares)		20,595,969	20,852,640
Ownership percentage		96.60%	96.20%
Non-controlling Interest in LLC
Class of Stock [Line Items]
Number of LLC units outstanding (in shares)		730,652	830,152
Ownership percentage		3.40%	3.80%