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Employee Benefits and Share-Based Compensation - Employee Stock Purchase Plan (ESPP) Activity (Details) $ in Millions	Mar. 31, 2016 USD ($)
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

Name:	omcl_ShareBasedArrangementswithEmployeesandNonemployeesLineItems
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

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	us-gaap_PlanNameAxis=omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
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: