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v3.25.2

Loans and Borrowings - Terms and Debt Repayment Schedule (Parenthetical) (Details) - Loan From Former Related Party - USD ($) $ in Thousands | Mar. 31, 2025 | Mar. 31, 2024
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Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 0 | $ 6,504
Accrued interest |  | $ 700

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- Definition The amount of outstanding funds that the entity is obligated to repay. + 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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Balance Type: | credit
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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- Definition Accrued interest. + References No definition available. + Details
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Namespace Prefix: | omse_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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