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Employee Benefits and Share-Based Compensation - Employee Stock Purchase Plan (ESPP) Activity (Details) $ in Millions | Mar. 31, 2016 USD ($)
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1997 Employee Stock Purchase Plan | Employee Stock Purchase Plan |
Share-Based Arrangements with Employees and Nonemployees [Line Items] |
Unrecognized compensation cost | $ 7.1

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- Definition [Line Items] for Share-Based Arrangements with Employees and Nonemployees [Table] + References No definition available. + Details
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Namespace Prefix: | omcl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |