v2.4.0.8

Organization and Summary of Significant Accounting Policies Significant supplier disclosure (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Unusual Risk or Uncertainty [Line Items] |  |  |  |
Purchases from significant supplier | $ 8.6 | $ 6.3 | $ 22.5 | $ 17.8

X
- 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

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