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Short term loans (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | --- | ---
Statement [Line Items] |  |  |
Short term loans | $ 0 | $ 1,630 | $ 3,457
Vendors |  |  |
Statement [Line Items] |  |  |
Short term loans | 0 | 1,630 |
Short term loans |  |  |
Statement [Line Items] |  |  |
Short term loans | $ 0 | $ 0 |

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

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- Definition The amount of current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=elva_ShortTermLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |