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Equity Offerings (Details) - Distribution Agreement - USD ($) | Nov. 03, 2017 | Jun. 30, 2018
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Subsidiary, Sale of Stock [Line Items] |  |
Maximum aggregate offering price | $ 125,000,000 |
Available to be offered |  | $ 110,300,000

X
- Definition Sale of Stock, Authorized Amount + References No definition available. + Details
Name: | omcl_SaleofStockAuthorizedAmount
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sale of Stock, Available for Issuance + References No definition available. + Details
Name: | omcl_SaleofStockAvailableforIssuance
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SubsidiarySaleOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=omcl_DistributionAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |