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Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Floor Financing (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Floor Financing Accrual [Roll Forward] |  |  |
Balance at beginning of year | $ 211 | $ 117 | $ 104
Add: Flooring expense | 8,526 | 5,813 | 4,288
Additions for Cobalt acquisition | 0 | 132 | 0
Less: Flooring paid | (8,056) | (5,851) | (4,275)
Balance at end of year | $ 681 | $ 211 | $ 117

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- Definition Floor Financing + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Floor Financing Accrual [Roll Forward] + References No definition available. + Details
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- Definition Floor Financing, Additions For Acquisition + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Floor Financing, Expense + References No definition available. + Details
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Namespace Prefix: | mbuu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Floor Financing, Payments + References No definition available. + Details
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Namespace Prefix: | mbuu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration