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v3.25.2

Working Capital Facilities (Details 1) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Sep. 30, 2024
Working Capital Facilities |  |
Promissory Note Beginning balance | $ 519 | $ 1,026
Finance costs | 14 | 37
Repayment of Promissory Note (ii) | (533) | 0
Repayment of Promissory Note(i) | 0 | (507)
Finance cost paid with options | 0 | (37)
Promissory Note Ending balance | $ 0 | $ 519

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- References No definition available. + Details
Name: | elva_DisclosureOfWorkingCapitalFacilitiesAbstract
Namespace Prefix: | elva_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | elva_InterestOnRevolvingCreditFacilityEndingBalances
Namespace Prefix: | elva_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | elva_ProceedsFromIssueOfBondsNotesAndDebentures1
Namespace Prefix: | elva_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | elva_PromissoryNoteBeginningBalance
Namespace Prefix: | elva_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | elva_PromissoryNoteFinanceCosts
Namespace Prefix: | elva_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The element represents repayment of promissory note. + References No definition available. + Details
Name: | elva_RepaymentOfPromissoryNote
Namespace Prefix: | elva_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash outflow for finance costs paid, classified as operating activities. [Refer: Finance costs] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 31 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_31&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration