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COMMITMENTS AND CONTINGENCIES - Repurchase Obligations (Details) $ in Millions	Sep. 30, 2024 USD ($)
Repurchase obligations
Total purchase obligation	$ 26.6
Floor plan lender one
Repurchase obligations
Total purchase obligation	20.5
Floor plan lender one | Minimum
Repurchase obligations
Total purchase obligation	8.0
Additional floor plan lenders
Repurchase obligations
Total purchase obligation	$ 6.1

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

Name:	us-gaap_PurchaseObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_CounterpartyNameAxis=mpx_FloorPlanLenderOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
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Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=mpx_AdditionalFloorPlanLendersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: