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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
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Period Type:	duration

The amount of non-current derivative financial liabilities. [Refer: Derivative financial liabilities]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard
-URIDate 2025-03-27

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of accelerated amortization of deferred loss.

No definition available.

Name:	vmar_AcceleratedAmortizationOfDeferredLoss
Namespace Prefix:	vmar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of amortization of deferred loss of derivative financial liabilities.

No definition available.

Name:	vmar_AmortizationOfDeferredLossDerivativeFinancialLiabilities
Namespace Prefix:	vmar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of derivative financial liabilities forced converted to common shares.

No definition available.

Name:	vmar_ForcedConversionToCommonSharesDerivativeFinancialLiabilities
Namespace Prefix:	vmar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The gains (losses) resulting from foreign currency translation of derivatives.

No definition available.

Name:	vmar_ForeignCurrencyTranslationGainLossOnDerivatives
Namespace Prefix:	vmar_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Amount of revaluation changes of derivative financial liabilities.

No definition available.

Name:	vmar_RevaluationDerivativeFinancialLiabilities
Namespace Prefix:	vmar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of derivative financial liabilities voluntary converted to common shares.

No definition available.