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Contingencies - Additional Information (Details) | 0 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 19, 2015 Executive_Officer | Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract] |  |
Number of executive officers in the Nelson v. Omnicell putative class action lawsuit | 2 us-gaap_LossContingencyNumberOfDefendants |
Standard product warranty, duration following installation |  | 30 days
Medication packaging system duration of limited warranties |  | 6 months

X
- Definition Standard Product Warrant Description, Duration Following Installation + References No definition available. + Details
Name: | omcl_StandardProductWarrantDescriptionDurationFollowingInstallation
Namespace Prefix: | omcl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Standard Product Warrant, Duration of Limited Warranty + References No definition available. + Details
Name: | omcl_StandardProductWarrantDurationofLimitedWarranty
Namespace Prefix: | omcl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Number of defendants named in a legal action. + References No definition available. + Details
Name: | us-gaap_LossContingencyNumberOfDefendants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration