Amount of pre tax short-term cash incentive compensation incurred during the reporting period.

No definition available.

Name:	mpx_ShortTermCashIncentiveCompensationBeforeTax
Namespace Prefix:	mpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Number of non-executive employee covered under STCI.

No definition available.

Name:	mpx_ShortTermCashIncentiveCompensationNumberOfNonExecutiveEmployee
Namespace Prefix:	mpx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Number of non-executive employee covered under STCI subject to contractual agreement.

No definition available.

Name:	mpx_ShortTermCashIncentiveCompensationNumberOfNonExecutiveEmployeeSubjectToContractualAgreement
Namespace Prefix:	mpx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Number of non-executive employee covered under STCI subject to discretionary determination.

No definition available.

Name:	mpx_ShortTermCashIncentiveCompensationNumberOfNonExecutiveEmployeeSubjectToDiscretionaryDetermination
Namespace Prefix:	mpx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Percentage of short term cash incentive compensation pre-tax profit incentive.

No definition available.

Name:	mpx_ShortTermCashIncentiveCompensationPreTaxProfitIncentivePercentage
Namespace Prefix:	mpx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of pre-tax profit incentive subject to contractual agreement.

No definition available.

Name:	mpx_ShortTermCashIncentiveCompensationPreTaxProfitIncentivePercentageSubjectToContractualAgreement
Namespace Prefix:	mpx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of pre-tax profit incentive subject to discretionary determination.

No definition available.

Name:	mpx_ShortTermCashIncentiveCompensationPreTaxProfitIncentivePercentageSubjectToDiscretionaryDetermination
Namespace Prefix:	mpx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

No definition available.

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

COMMITMENTS AND CONTINGENCIES - Short term cash incentive compensation (Details) $ in Thousands		3 Months Ended			6 Months Ended		9 Months Ended
	Oct. 01, 2023 employee	Jun. 30, 2024 USD ($) employee	Sep. 30, 2023 employee	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) employee	Jun. 30, 2023 USD ($)	Sep. 30, 2023 employee
COMMITMENTS AND CONTINGENCIES
Number of non-executive employee		4			4
Pre-tax profit incentive percentage			16.00%
Number of non-executive employee subject to contractual agreement			1				1
Pre-tax profit incentive percentage subject to contractual agreement							7.00%
Pre-tax profit incentive percentage subject to discretionary determination	9.00%
Number of non-executive employee, subject to discretionary determination	3
STCI expense \| $		$ 653		$ 3,542	$ 1,513	$ 7,285