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v3.25.2

Trade Receivables - Additional Information (Details) | 12 Months Ended
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Mar. 31, 2025 USD ($)
Trade and other receivables [abstract] |
Interest charged outstanding balances | $ 0

X
- References No definition available. + Details
Name: | ifrs-full_TradeAndOtherReceivablesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest charged outstanding balances. + References No definition available. + Details
Name: | omse_InterestChargedOutstandingBalances
Namespace Prefix: | omse_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration