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Inventories - Additional Information (Details) - USD ($) | 3 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 15, 2023 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Disclosure of inventory [abstract] |  |  |  |  |
Inventories cost |  |  | $ 82,000 | $ 70,400,000 | $ 43,100,000
Reversal of inventories obsolescence | $ 6,000.000 | $ 300,000 | 600,000 |  | 5,000.000
Reversal of inventories obsolescence for 2025 | $ 6,000 | $ 335,000 | $ (571,000) |  | $ (5,000)

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- Definition The amount of inventories recognised as an expense during the period. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2024-01-01 -Paragraph 36 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=2&code=ifrs-tx-2024-en-r&anchor=para_36_d&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount recognised resulting from the write-down of inventories to net realisable value or reversals of those write-downs. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 98 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_98_a&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Allowance for/(reversal of) inventories obsolescence. + References No definition available. + Details
Name: | omse_AllowanceForReversalOfInventoriesObsolescence
Namespace Prefix: | omse_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disclosure of inventory. + References No definition available. + Details
Name: | omse_DisclosureOfInventoryAbstract
Namespace Prefix: | omse_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration