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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: |