The interest rate on borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 7
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_7&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_BorrowingsInterestRate
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfFinancialLiabilitiesLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The gains resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 85
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_85&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_GainsOnChangeInFairValueOfDerivatives
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_NotionalAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of instruments or interests issued or issuable at acquisition date for equity interests of the acquirer transferred as consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2025-01-01
-Paragraph B64
-Subparagraph f
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B64_f_iv&doctype=Appendix&subtype=B
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The value of significant unobservable input used in the measurement of the fair value of liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_d&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_SignificantUnobservableInputLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of gain (loss) arising from revaluation of contingent consideration relating to host contract.

+ References

No definition available.

+ Details

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

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

No definition available.

+ Details

Name:	vmar_IfrsDebtInstrumentConvertibleConversionPrice
Namespace Prefix:	vmar_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the required periodic payments applied to interest.

+ References

No definition available.

+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	vmar_IfrsDebtInstrumentTerm
Namespace Prefix:	vmar_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the share price

+ References

No definition available.

+ Details

Name:	vmar_IfrsSharePrice
Namespace Prefix:	vmar_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_BusinessCombinationsAxis=vmar_NauticalVenturesGroupIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=ifrs-full_ContingentConsiderationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_UnobservableInputsAxis=vmar_DiscountForLackOfMarketabilityMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_UnobservableInputsAxis=vmar_DividendYieldMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfFinancialLiabilitiesAxis=vmar_EmbeddedDerivativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ValuationTechniquesUsedInFairValueMeasurementAxis=ifrs-full_OptionPricingModelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=vmar_SubsequentConvertibleNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_UnobservableInputsAxis=vmar_ProbabilityOfIssuanceMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=vmar_RogerMooreMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=vmar_VotingCommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=vmar_InitialConvertibleNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=vmar_RealEstateNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Derivative liabilities - Purchase consideration - NVG acquisition (Details)			3 Months Ended		9 Months Ended
	Oct. 21, 2025 USD ($) shares $ / shares	Jun. 20, 2025 USD ($) $ / shares	May 31, 2026 USD ($)	May 31, 2025 USD ($)	May 31, 2026 USD ($)	May 31, 2025 USD ($)
Derivative Liabilities
Gain (loss) on revaluation of contingent consideration			$ (315,331)		$ (782,126)
Nautical Ventures Group Inc.
Derivative Liabilities
Gain (loss) on revaluation of contingent consideration			(315,331)	$ 0	(782,126)	$ 0
Gain on derivative liabilities			$ 6,295	$ 0	$ 366,751	$ 0
Nautical Ventures Group Inc. \| Contingent consideration
Derivative Liabilities
Level 3 valuation inputs (in %)		25
Nautical Ventures Group Inc. \| Discount for lack of marketability, \| Contingent consideration
Derivative Liabilities
Share price \| $ / shares		$ 3,136
Nautical Ventures Group Inc. \| Dividend yield \| Derivative Liability \| Black-Scholes option pricing model
Derivative Liabilities
Level 3 valuation inputs (in %)		0
Nautical Ventures Group Inc. \| Subsequent Convertible Note \| Probability of issuance rate \| Derivative Liability
Derivative Liabilities
Level 3 valuation inputs (in %)			50		50
Nautical Ventures Group Inc. \| Subsequent Convertible Note \| Probability of issuance rate \| Derivative Liability \| Black-Scholes option pricing model
Derivative Liabilities
Level 3 valuation inputs (in %)		50
Nautical Ventures Group Inc. \| Roger Moore \| Voting Common Stock
Derivative Liabilities
Number of shares in share consideration (in shares) \| shares	638
Nautical Ventures Group Inc. \| Roger Moore \| Initial Convertible Note
Derivative Liabilities
Notional amount		$ 4,000,000
Convertible note, accrued interest rate (%)		6.00%
Convertible note, monthly interest payment		$ 20,000
Convertible note, convertible exercise price (in $ per share) \| $ / shares		$ 3,449.6
Nautical Ventures Group Inc. \| Roger Moore \| Subsequent Convertible Note
Derivative Liabilities
Notional amount		$ 2,000,000
Convertible note, accrued interest rate (%)		6.00%
Convertible note, monthly interest payment		$ 10,000
Convertible note, convertible exercise price (in $ per share) \| $ / shares		$ 3,449.6
Convertible note term (in months)		36 months
Nautical Ventures Group Inc. \| Roger Moore \| Subsequent Convertible Note \| Probability of issuance rate
Derivative Liabilities
Level 3 valuation inputs (in %)		50
Nautical Ventures Group Inc. \| Roger Moore \| Real Estate Note
Derivative Liabilities
Notional amount	$ 2,000,000
Convertible note, accrued interest rate (%)	6.00%
Convertible note, monthly interest payment	$ 10,000
Convertible note, convertible exercise price (in $ per share) \| $ / shares	$ 3,449.6
Convertible note term (in months)	36 months