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Subsequent Events - Additional Information (Details) (Subsequent Event [Member], USD $) | 0 Months Ended |
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Apr. 30, 2015 | Apr. 21, 2015 | Apr. 29, 2015
Avantec [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Escrow deposit for Shares Purchase Agreement | $ 1,800,000 omcl_BusinessCombinationConsiderationPlacedinEscrow / us-gaap_BusinessAcquisitionAxis = omcl_AvantecHeathcareLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Cash payment for Shares Purchase Agreement | 10,200,000 us-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 | 3,000,000.0 us-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 | 3,000,000.0 us-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 |  | 16,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = omcl_Mach4AutomatisierungstechnikGmbHMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Escrow deposit for Shares Purchase Agreement |  | 2,700,000 omcl_BusinessCombinationConsiderationPlacedinEscrow / us-gaap_BusinessAcquisitionAxis = omcl_Mach4AutomatisierungstechnikGmbHMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Exist debt of acquiree |  | $ 900,000 us-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

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- Definition Business Combination, Consideration Placed in Escrow + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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