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Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Dealer Rebates (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Dealer Rebate Accrual [Roll Forward] |  |  |
Balance at beginning of year | $ 3,178 | $ 3,912 | $ 3,165
Add: Dealer rebate expense | 15,713 | 12,960 | 6,440
Less: Dealer rebates paid | (13,332) | (13,694) | (5,693)
Balance at end of year | $ 5,559 | $ 3,178 | $ 3,912

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- Definition Accrued Dealer Rebates, Current + References No definition available. + Details
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- Definition Change In Accrual For Dealer Rebates [Table Text Block] + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Dealer Rebate Accrual [Roll Forward] + References No definition available. + Details
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Namespace Prefix: | mbuu_
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- Definition Payments Of Dealer Rebates + References No definition available. + Details
Name: | mbuu_PaymentsOfDealerRebates
Namespace Prefix: | mbuu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration