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Organization and Summary of Significant Accounting Policies Significant supplier disclosure (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Unusual Risk or Uncertainty [Line Items] |  |
Purchases from significant supplier | $ 8.9 | $ 7.2

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- Definition Purchases from significant supplier - pruchasses during period from most significant supplier mentioned in Supplier Dependence section of Note 1 + References No definition available. + Details
Name: | omcl_PurchasesFromSignificantSupplier
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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