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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

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- Definition Amount of repurchases of inventory under contractual agreements. + References No definition available. + Details
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Namespace Prefix: | mpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- 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

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

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