v2.4.0.8

Commitments rented properties data (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended	53 Months Ended	3 Months Ended	12 Months Ended	53 Months Ended	3 Months Ended		12 Months Ended	3 Months Ended
	Sep. 30, 2013	Dec. 31, 2011 Lease- Mountain View, CA 590 Middlefield road [Member] sqft	Dec. 31, 2012 Lease- Mountain View, CA 590 Middlefield road [Member]	Jun. 30, 2012 Lease- Mountain View, CA 590 Middlefield road [Member]	Sep. 30, 2012 Lease - Milpitas, CA 735 Sycamore Drive [Member] sqft	Dec. 31, 2012 Lease - Milpitas, CA 735 Sycamore Drive [Member]	Jun. 30, 2012 Lease - Milpitas, CA 735 Sycamore Drive [Member]	Sep. 30, 2013 Lease - St. Petersburg, FL 2003 gaudy Bldvd. North [Member]	Sep. 30, 2012 Lease - St. Petersburg, FL 2003 gaudy Bldvd. North [Member] sqft	Dec. 31, 2012 Lease - St. Petersburg, FL 2003 gaudy Bldvd. North [Member]	Sep. 30, 2013 lease - Leeds, United Kingdom [Member]	Sep. 30, 2012 lease - Leeds, United Kingdom [Member] sqft
Operating Leased Assets [Line Items]
Document Period End Date	Sep. 30, 2013
property subject to operating lease, net rentable area		100,000			46,000				132,500			16,500
property subject to operating lease term duration				10 years			60 months
Operating Leases, Rent Expense, Minimum Rentals				$ 40.0			$ 1.8	$ 3.9			$ 1.2
property subject to lease, 1st extension term duration								12 years			10 years
Property subject to operating lease, 2nd extension term duration			60 months							60 months
Lease Expiration Date											Jun. 08, 2021
property subject to lease, 1st extension term duration			60 months			60 months				60 months	0

X

- Definition

The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

+ References

No definition available.

+ Details

Name:	dei_DocumentPeriodEndDate
Namespace Prefix:	dei_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

property subject to lease, 1st extension term duration (in months)

+ References

No definition available.

+ Details

Name:	omcl_PropertySubjectToLease1StExtensionTermDuration
Namespace Prefix:	omcl_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

property subject to lease is the length of the original term (base period) of lease, from date of control of property to end of base term

+ References

No definition available.

+ Details

Name:	omcl_PropertySubjectToLeaseOriginalTerm
Namespace Prefix:	omcl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Property subject to operating lease, 2nd extension term duration (in months)

+ References

No definition available.

+ Details

Name:	omcl_PropertySubjectToOperatingLease2NdExtensionTermDuration
Namespace Prefix:	omcl_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

property subject to operating lease, net rentable area = net rentable space in square feet

+ References

No definition available.

+ Details

Name:	omcl_PropertySubjectToOperatingLeaseNetRentableArea
Namespace Prefix:	omcl_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

property subject to operating lease term duration - future or remaining base term in months

+ References

No definition available.

+ Details

Name:	omcl_PropertySubjectToOperatingLeaseTermDuration
Namespace Prefix:	omcl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 122

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 25

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682

+ Details

Name:	us-gaap_OperatingLeasesRentExpenseMinimumRentals
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration