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Related Parties - Summary of Amount Due from a Related Party (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Mar. 31, 2024
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Disclosure of transactions between related parties [line items] |  |
Amount due from a related party | $ 1,584 | $ 1,585
OMS Energy Technologies Pte. Ltd. |  |
Disclosure of transactions between related parties [line items] |  |
Amount due from a related party | $ 1,584 | $ 1,585

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- Definition The amounts receivable resulting from related party transactions. [Refer: Total for all related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2024-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_20&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2024-01-01 -Paragraph 18 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2024-en-r&anchor=para_18_b&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=omse_OMSEnergyTechnologiesPteLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |