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Subsequent Events - Additional Information (Details) (Subsequent Event [Member], USD $)
0 Months Ended
Apr. 30, 2015
Apr. 21, 2015
Apr. 29, 2015
Avantec [Member]      
Subsequent Event [Line Items]      
Escrow deposit for Shares Purchase Agreement $ 1,800,000omcl_BusinessCombinationConsiderationPlacedinEscrow
/ us-gaap_BusinessAcquisitionAxis
= omcl_AvantecHeathcareLimitedMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Cash payment for Shares Purchase Agreement 10,200,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= omcl_AvantecHeathcareLimitedMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Maximum [Member] | Avantec [Member] | 2015 Booking Milestone [Member]      
Subsequent Event [Line Items]      
Business Combination, Contingent Consideration, Liability 3,000,000.0us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= omcl_AvantecHeathcareLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= omcl_ReserveforEarnoutReceivableForTwentyFifteenBookingMilestoneMember
   
Maximum [Member] | Avantec [Member] | 2016 Booking Milestone [Member]      
Subsequent Event [Line Items]      
Business Combination, Contingent Consideration, Liability 3,000,000.0us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= omcl_AvantecHeathcareLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= omcl_ReserveforEarnoutReceivableForTwentySixteenBookingMilestoneMember
   
Omnicell International [Member] | Mach 4 [Member]      
Subsequent Event [Line Items]      
Purchase amount of Share Purchase Agreement   16,500,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= omcl_Mach4AutomatisierungstechnikGmbHMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Escrow deposit for Shares Purchase Agreement   2,700,000omcl_BusinessCombinationConsiderationPlacedinEscrow
/ us-gaap_BusinessAcquisitionAxis
= omcl_Mach4AutomatisierungstechnikGmbHMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Exist debt of acquiree   $ 900,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= omcl_Mach4AutomatisierungstechnikGmbHMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Avantec [Member]      
Subsequent Event [Line Items]      
Percentage of ownership under the equity method     15.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentAxis
= omcl_AvantecHeathcareLimitedMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember