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Commitments, Contingent Liabilities, and Legal Proceedings (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2025
Commitments and Contingencies Disclosure [Abstract]
Merger termination fees	$ 80	$ 80

X

- Definition

The amount of cash paid for termination of merger agreement during the reporting period.

+ References

No definition available.

+ Details

Name:	omi_MergerTerminationFees
Namespace Prefix:	omi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration