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Equity Offerings (Details) - Distribution Agreement - USD ($)	Nov. 03, 2017	Sep. 30, 2018
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: