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COMMITMENTS AND CONTINGENCIES - Dealer floor plan financing (Details)	3 Months Ended
	Dec. 31, 2024
Third party floor plan lenders
COMMITMENTS AND CONTINGENCIES
Purchase obligation term	3 years

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- 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

Name:	mpx_CommitmentsAndContingenciesLineItems
Namespace Prefix:	mpx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The period in which purchase arrangement has been agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

Name:	mpx_PurchaseObligationTerm
Namespace Prefix:	mpx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- Details

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