Non-controlling Interest - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Noncontrolling Interest [Line Items]
Tax distributions payable to non-controlling LLC Unit holders	$ 559	$ 686
Non-controlling LLC Unit holders ownership in Malibu Boats Holdings, LLC
Noncontrolling Interest [Line Items]
Tax distributions payable to non-controlling LLC Unit holders	559		$ 511
Tax distributions paid to non-controlling LLC Unit holders	$ 1,228	$ 963
Class A Common Stock
Noncontrolling Interest [Line Items]
Issuance LLC Units (in shares)	319,956
Treasury Stock, Common
Noncontrolling Interest [Line Items]
Treasury stock, shares, retired (in shares)	24,207