Represents the additional forgiveness on lease liability.

No definition available.

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

- 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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Adjustment to lease liability and right-of-use asset from government grant (IAS 20).

+ References

No definition available.

+ Details

Name:	gpvrf_GovernmentGrantRelatedLeaseAdjustment
Namespace Prefix:	gpvrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Total lease payment reduction agreed with lessor based on submitted employee reports.

+ References

No definition available.

+ Details

Name:	gpvrf_LeasePaymentReductionAgreed
Namespace Prefix:	gpvrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents about lease payment reduction deferred.

+ References

No definition available.

+ Details

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Namespace Prefix:	gpvrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount for lease payments have been suspended in anticipation of agreed lease reduction.

+ References

No definition available.

+ Details

Name:	gpvrf_LeasePaymentSuspensionAmount
Namespace Prefix:	gpvrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents about monthly lease payments.

+ References

No definition available.

+ Details

Name:	gpvrf_MonthlyLeasePayments
Namespace Prefix:	gpvrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the amount related to payments for short-term leases.

+ References

No definition available.

+ Details

Name:	gpvrf_PaymentsForShortTermLeases
Namespace Prefix:	gpvrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the amount related to payments for short-term leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	gpvrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the amount of right-of-use (RoU) assets added during the period.

+ References

No definition available.

+ Details

Name:	gpvrf_RightOfUseAssetAdditions
Namespace Prefix:	gpvrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

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+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- References

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-URIDate 2025-03-27

+ Details

Name:	ifrs-full_InterestExpenseOnLeaseLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-URIDate 2025-03-27

+ Details

Name:	ifrs-full_RentalExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-URIDate 2025-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
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- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	gpvrf_LeaseAgreementAxis=gpvrf_PropertyInRiversideMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=gpvrf_SouthCharlestonDevelopmentAuthorityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Right of Use Assets and Lease Liabilities (Narrative) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Jan. 01, 2025
Disclosure of Detailed Information About Right of Use Assets and Lease Liabilities [Line Items]
Interest expense incurred	$ 577,531	$ 531,987	$ 377,026
Depreciation expense	874,660	730,803	785,306
Rental payments	1,212,682	957,685	1,050,611
Payments for short-term leases	112,325	$ 288,303	$ 91,312
Remaining payments on short term leases	3,083
RoU asset addition	$ 2,500,000
Minimum [Member]
Disclosure of Detailed Information About Right of Use Assets and Lease Liabilities [Line Items]
Discounted rate of interest	8.00%
Maximum [Member]
Disclosure of Detailed Information About Right of Use Assets and Lease Liabilities [Line Items]
Discounted rate of interest	12.00%
Property In Riverside [Member]
Disclosure of Detailed Information About Right of Use Assets and Lease Liabilities [Line Items]
Monthly lease payments				$ 50,439
Property In Riverside [Member] \| Minimum [Member]
Disclosure of Detailed Information About Right of Use Assets and Lease Liabilities [Line Items]
Monthly lease payments				50,439
Property In Riverside [Member] \| Maximum [Member]
Disclosure of Detailed Information About Right of Use Assets and Lease Liabilities [Line Items]
Monthly lease payments				$ 56,204
South Charleston Development Authority [Member]
Disclosure of Detailed Information About Right of Use Assets and Lease Liabilities [Line Items]
Agreed lease reduction amount by lessor	$ 578,500
Suspended payments to account for the reduction	578,500
Lessor’s interpretation: reduction applies at end of lease	578,500
Government grant related lease adjustment	229,012
Additional forgiveness on lease liability	$ 6,700,000