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Subsequent Events - Additional Information (Details) (Subsequent Event [Member], USD $) | 0 Months Ended
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Mar. 19, 2015 Executive_Officer | Feb. 27, 2015 | Feb. 26, 2015
Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Total aggregate consideration |  |  | $ 18,000,000 omcl_BusinessCombinationAgreedPurchasePriceLessExistingDebtandAdjustments / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Cost incurred of certain discounts and Omnicell products allegedly provided |  | $ 0 omcl_LossContingencyAllegationsCostIncurredofProductsAllegedlyProvided / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Number of executive officers in the Nelson v. Omnicell putative class action lawsuit | 2 us-gaap_LossContingencyNumberOfDefendants / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |

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- Definition Business Combination, Agreed Purchase Price, Less Existing Debt and Adjustments + References No definition available. + Details
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Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Loss Contingency, Allegations, Cost Incurred of Products Allegedly Provided + References No definition available. + Details
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Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Number of defendants named in a legal action. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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