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Commitment and Contingencies (Details) $ in Thousands	Nov. 27, 2019 actions	Aug. 22, 2019 actions	Jul. 27, 2019 actions	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Repurchase obligations				$ 101,476	$ 161,356
Financing receivables				$ 44	$ 375
Number of actions | actions	2	2	2

X

- Definition

Financing Receivables

+ References

No definition available.

+ Details

Name:	mbuu_FinancingReceivables
Namespace Prefix:	mbuu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Floor Financing, Repurchase Obligations

+ References

No definition available.

+ Details

Name:	mbuu_FloorFinancingRepurchaseObligations
Namespace Prefix:	mbuu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Loss Contingency Number Of Actions

+ References

No definition available.

+ Details

Name:	mbuu_LossContingencyNumberOfActions
Namespace Prefix:	mbuu_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration