Income Taxes	6 Months Ended
Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Malibu Boats, Inc. is taxed as a C corporation for U.S. income tax purposes and is therefore subject to both federal and state taxation at a corporate level. The LLC continues to operate in the United States as a partnership for U.S. federal income tax purposes. Income taxes are computed in accordance with ASC Topic 740, Income Taxes, and reflect the net tax effects of temporary differences between the financial reporting carrying amounts of assets and liabilities and the corresponding income tax amounts. The Company has deferred tax assets and liabilities and maintains valuation allowances where it is more likely than not that all or a portion of deferred tax assets will not be realized. To the extent the Company determines that it will not realize the benefit of some or all of its deferred tax assets, such deferred tax assets will be adjusted through the Company’s provision for income taxes in the period in which this determination is made. As of December 31, 2018 and June 30, 2018, the Company maintained a valuation allowance of $13,215 and $12,716, respectively, against deferred tax assets related to state net operating losses and future amortization deductions (with respect to the Section 754 election) that are reported in the Tennessee corporate tax return without offsetting income, which is taxable at the LLC. The increase in the valuation allowance is due to the exchanges of LLC Units into Class A common stock by certain LLC Unit holders during the six months ended December 31, 2018. On December 22, 2017, the Tax Act was enacted which, among a number of its provisions, lowered the U.S. corporate tax rate from 35% to 21%, effective January 1, 2018. The Company’s consolidated interim effective tax rate is based upon expected annual income from operations, statutory tax rates and tax laws in the various jurisdictions in which the Company operates. Significant or unusual items, including those related to the change in U.S. tax law noted above as well as other adjustments to accruals for tax uncertainties, are recognized in the quarter in which the related event occurs. On October 15, 2018, the Company completed its acquisition of Pursuit. This did not have a significant impact to the effective tax rate. For the three months ended December 31, 2018 and 2017, the Company's effective tax rate was 21.5% and 344.9%, respectively. For the six months ended December 31, 2018 and 2017, the Company's effective tax rate was 22.2% and 98.4%, respectively. For the three months ended December 31, 2018, the Company's effective tax rate exceeded the statutory federal income tax rate of 21% due to the impact of U.S. state taxes. This effect was partially offset by a windfall benefit generated by certain stock based compensation during the quarter, the research and development tax credit, and the impact of non-controlling interests in the LLC, a passthrough entity for U.S. federal tax purposes. For the three and six months ended December 31, 2017 , the principal differences in the Company's effective tax rate with the blended statutory federal income tax rate of approximately 28% relate to the impact of one-time items due to the change in tax law enacted in connection with the Tax Act and the impact of the additional jurisdictions in which the Company is taxed as a result of the Cobalt acquisition. Additionally, the Company's effective tax rate for the three months ended December 31, 2017 is related to, to a lesser extent, the impact of the non-controlling interests in the LLC, a pass-through entity for U.S. federal tax purposes, state income taxes attributable to the LLC, and the benefit of deductions under Section 199 of the Internal Revenue Code.

Income Taxes

Malibu Boats, Inc. is taxed as a C corporation for U.S. income tax purposes and is therefore subject to both federal and state taxation at a corporate level. The LLC continues to operate in the United States as a partnership for U.S. federal income tax purposes.

Income taxes are computed in accordance with ASC Topic 740, Income Taxes, and reflect the net tax effects of temporary differences between the financial reporting carrying amounts of assets and liabilities and the corresponding income tax amounts. The Company has deferred tax assets and liabilities and maintains valuation allowances where it is more likely than not that all or a portion of deferred tax assets will not be realized. To the extent the Company determines that it will not realize the benefit of some or all of its deferred tax assets, such deferred tax assets will be adjusted through the Company’s provision for income taxes in the period in which this determination is made.

As of December 31, 2018 and June 30, 2018, the Company maintained a valuation allowance of $13,215 and $12,716, respectively, against deferred tax assets related to state net operating losses and future amortization deductions (with respect to the Section 754 election) that are reported in the Tennessee corporate tax return without offsetting income, which is taxable at the LLC. The increase in the valuation allowance is due to the exchanges of LLC Units into Class A common stock by certain LLC Unit holders during the six months ended December 31, 2018.

On December 22, 2017, the Tax Act was enacted which, among a number of its provisions, lowered the U.S. corporate tax rate from 35% to 21%, effective January 1, 2018. The Company’s consolidated interim effective tax rate is based upon expected annual income from operations, statutory tax rates and tax laws in the various jurisdictions in which the Company operates. Significant or unusual items, including those related to the change in U.S. tax law noted above as well as other adjustments to accruals for tax uncertainties, are recognized in the quarter in which the related event occurs.

On October 15, 2018, the Company completed its acquisition of Pursuit. This did not have a significant impact to the effective tax rate. For the three months ended December 31, 2018 and 2017, the Company's effective tax rate was 21.5% and 344.9%, respectively. For the six months ended December 31, 2018 and 2017, the Company's effective tax rate was 22.2% and 98.4%, respectively. For the three months ended December 31, 2018, the Company's effective tax rate exceeded the statutory federal income tax rate of 21% due to the impact of U.S. state taxes. This effect was partially offset by a windfall benefit generated by certain stock based compensation during the quarter, the research and development tax credit, and the impact of non-controlling interests in the LLC, a passthrough entity for U.S. federal tax purposes. For the three and six months ended December 31, 2017 , the principal differences in the Company's effective tax rate with the blended statutory federal income tax rate of approximately 28% relate to the impact of one-time items due to the change in tax law enacted in connection with the Tax Act and the impact of the additional jurisdictions in which the Company is taxed as a result of the Cobalt acquisition. Additionally, the Company's effective tax rate for the three months ended December 31, 2017 is related to, to a lesser extent, the impact of the non-controlling interests in the LLC, a pass-through entity for U.S. federal tax purposes, state income taxes attributable to the LLC, and the benefit of deductions under Section 199 of the Internal Revenue Code.