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WARRANTY COSTS AND OTHER CONTINGENCIES- Repurchase Obligations (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2020
Repurchase obligations
Repurchases of inventory	$ 3.4
Total purchase obligation		$ 14.1
Floor plan lender one
Repurchase obligations
Total purchase obligation		12.2
Additional floor plan lenders
Repurchase obligations
Total purchase obligation		$ 1.9

X

- Definition

Amount of repurchases of inventory under contractual agreements.

+ References

No definition available.

+ Details

Name:	mpx_RepurchaseObligationsRepurchasesOfInventoryUnderContractualAgreements
Namespace Prefix:	mpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

Name:	us-gaap_ProductWarrantyLiabilityLineItems
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_CounterpartyNameAxis=mpx_AdditionalFloorPlanLendersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: