v2.4.0.6

Deferred Gross Profit (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Deferred Gross Profit [Abstract]
Sales of Medication and supply dispensing systems and packaging equipment, which have been delivered and invoiced but not yet installed	$ 39,937	$ 30,138
Cost of revenues, excluding installation costs	(12,999)	(9,366)
Deferred gross profit	$ 26,938	$ 20,772

X

- Definition

Cost of sales, excluding installation costs for deferred gross profit - Cost of sales relieved from inventory for the products delivered, invoiced but not yet installed counted in Deferred Gross profit. This excludes the future installation cost, booked as period expense.

+ References

No definition available.

+ Details

Name:	omcl_CostOfSalesExcludingInstallationCostsForDeferredGrossProfit
Namespace Prefix:	omcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The gross profit not recognized in income that consists of sales of tangible products, which have been delivered and invoiced but not yet installed less the costs of revenues, excluding the installation costs.

+ References

No definition available.

+ Details

Name:	omcl_DeferredGrossProfit
Namespace Prefix:	omcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	omcl_DeferredGrossProfitAbstract
Namespace Prefix:	omcl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Product sales, delivered and invoiced not installed - Deferred revenue value (before subtracting COS) for medical dispensing and supply systems that are delivered and invoiced but not yet installed.

+ References

No definition available.

+ Details

Name:	omcl_ProductSalesDeliveredAndInvoicedNotInstalled
Namespace Prefix:	omcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant