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

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- References

No definition available.

+ Details

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

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- 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