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Segment Information - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Products & Healthcare Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Non-cash adjustments to merchandise inventory	$ 5.4	$ 4.9
Patient Direct
Segment Reporting, Revenue Reconciling Item [Line Items]
Net book value of dispositions	$ 9.6	$ 9.0

X

- Definition

The amount of non-cash adjustments to inventory by the last in first out method.

+ References

No definition available.

+ Details

Name:	omi_InventoryNonCashAdjustments
Namespace Prefix:	omi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentDisposals
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=omi_ProductsHealthcareServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=omi_PatientDirectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: