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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 |  |

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