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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 14, 2019 | Nov. 01, 2018 | Aug. 22, 2018 | Nov. 06, 2017 | Jun. 30, 2017 | Jun. 29, 2017 | Nov. 04, 2016 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 06, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  |  |  | 69,973 | 40,000 | 104,000 |
Options granted (in dollars per share) |  |  |  |  |  |  |  | $ 40.82 | $ 30.87 | $ 25.85 |
Cash paid for tax withholdings |  |  |  |  |  |  |  | $ 1,219 | $ 691 | $ 258 |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, incentive stock awards, weighted average grant date fair value (in dollars per share) |  |  |  |  |  |  |  | $ 41.63 | $ 30.80 | $ 15.55 |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting period | 4 years |  | 4 years |  |  |  |  |  |  |  |
Options granted (in shares) | 19,973 |  | 50,000 |  |  |  |  |  |  |  |
Risk free interest rate | 2.53% |  | 2.70% |  |  |  |  |  |  |  |
Expected volatility rate | 39.00% |  | 38.40% |  |  |  |  |  |  |  |
Expected term | 4 years 3 months |  | 4 years 3 months |  |  |  |  |  |  |  |
Expected dividend rate | 0.00% |  | 0.00% |  |  |  |  |  |  |  |
Long-Term Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares reserved for issuance in the long-term incentive plan (in shares) |  |  |  |  |  |  |  |  |  |  | 1,700,000
Number of shares available for grant (in shares) |  |  |  |  |  |  |  | 854,287 |  |  |
Grants in period |  | $ 3,474 |  |  |  |  |  |  |  |  |
Weighted average contractual term outstanding |  |  |  |  |  |  |  | 4 years 6 months 18 days |  |  |
Weighted average contractual term outstanding and exercisable |  |  |  |  |  |  |  | 4 years 29 days |  |  |
Intrinsic value exercised |  |  |  |  |  |  |  | $ 732 |  |  |
Intrinsic value outstanding |  |  |  |  |  |  |  | 1,339 |  |  |
Intrinsic value outstanding and exercisable |  |  |  |  |  |  |  | 398 |  |  |
Stock compensation expense |  |  |  |  |  |  |  | 2,607 | $ 1,973 | $ 1,396 |
Unrecognized compensation cost |  |  |  |  |  |  |  | $ 6,431 | $ 4,428 |  |
Long-Term Incentive Plan | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, incentive stock awards, granted (in shares) |  | 35,000 |  |  |  |  |  |  |  |  |
Long-Term Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, incentive stock awards, granted (in shares) |  | 48,000 |  |  |  |  | 130,500 |  |  |  |
Share-based compensation, incentive stock awards, weighted average grant date fair value (in dollars per share) |  |  |  |  |  |  | $ 15.62 |  |  |  |
Grants in period |  |  |  | $ 2,436 |  |  | $ 2,039 |  |  |  |
Options granted (in shares) |  |  |  | 78,900 |  |  |  |  |  |  |
Issuance of equity for services (in shares) |  |  |  |  |  |  |  | 17,663 | 23,838 | 37,727 |
Long-Term Incentive Plan | Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, incentive stock awards, weighted average grant date fair value (in dollars per share) |  | $ 41.85 |  |  |  |  |  |  |  |  |
Percentage, restricted stock |  |  |  |  |  | 25.00% |  |  |  |  |
Grants in period |  |  |  | $ 405 |  |  |  |  |  |  |
Award vesting period |  |  |  | 4 years |  |  |  |  |  |  |
Options granted (in shares) |  |  |  | 40,000 |  | 104,000 |  |  |  |  |
Fair value assumptions, exercise price (in dollars per share) | $ 37.55 |  | $ 42.13 |  |  |  |  |  |  |  |
Options granted (in dollars per share) |  |  |  | $ 30.87 |  | $ 25.85 |  |  |  |  |
Vested in period, fair value | $ 263 |  | $ 733 |  | $ 866 |  |  |  |  |  |
Risk free interest rate |  |  |  | 2.00% | 2.10% |  |  |  |  |  |
Expected volatility rate |  |  |  | 37.10% | 36.10% |  |  |  |  |  |
Expected term |  |  |  | 4 years 2 months 30 days | 4 years 3 months |  |  |  |  |  |
Shares withheld (in shares) |  |  |  |  |  |  |  | 26,458 |  |  |
Long-Term Incentive Plan | Non-Vested Service Period Awards |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual terms |  |  |  |  |  |  |  | 1 year |  |  |
Long-Term Incentive Plan | Performance Target Awards |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual terms |  |  |  |  |  |  |  | 6 months |  |  |
Long-Term Incentive Plan | Deferred Profit Sharing |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  |  |  |  | $ 283 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of equity for services (in shares) |  |  |  |  |  |  |  |  | 5,000 |  |
Common Stock | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of equity for services (in shares) |  |  |  |  |  |  |  |  |  | 7,000 |
Common Stock | Class A Common Stock | Long-Term Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, incentive stock awards, weighted average grant date fair value (in dollars per share) |  |  |  |  |  |  |  | $ 42.29 | $ 30.52 | $ 15.42 |
Issuance of equity for services (in shares) |  |  |  |  |  |  |  | 853 | 4,567 | 6,857 |
Share-based Compensation Award, Tranche One | Long-Term Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage, restricted stock |  | 71.00% |  | 72.00% |  |  | 63.00% |  |  |  |
Share-based Compensation Award, Tranche One | Long-Term Incentive Plan | Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage, restricted stock |  |  |  | 50.00% |  |  |  |  |  |  |
Share-based Compensation Award, Tranche Two | Long-Term Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage, restricted stock |  | 29.00% |  |  |  |  |  |  |  |  |
Share-based Compensation Award, Tranche Two | Long-Term Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage, restricted stock |  |  |  | 28.00% |  |  | 37.00% |  |  |  |
Award vesting period |  | 4 years |  | 4 years |  |  |  |  |  |  |
Share-based Compensation Award, Tranche Two | Long-Term Incentive Plan | Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage, restricted stock |  |  |  | 50.00% |  |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
Name: | us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders. + References No definition available. + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=mbuu_LongTermIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=mbuu_NonVestedServicePeriodAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=mbuu_PerformanceTargetAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_DeferredProfitSharingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |