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Stock Option Plans and Share-Based Compensation - ESPP- Employee stock purchase plan (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP max percent of earnings contributable		15.00%
ESPP purchase price as percent of begin and-or ending fair value		85.00%
Capital shares reserved for future issuance	619,616	619,616
Shares issued in period	227,275	481,284
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized		2,622,426
Compensation not yet recognized	$ 2.6	$ 2.6
Compensation cost not yet recognized, period for recognition		1 year

X

- Definition

ESPP max percent of earnings contributable - maxium percentage of employee earnings which may be contributed to the ESPP (also subject to dollar max)

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

ESPP purchase price as percent of begin and-or ending fair value - employees get the benefit of discount from close price, with more favorable of begin or end of enrollment period

+ References

No definition available.

+ Details

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Namespace Prefix:	omcl_
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Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Period Type:	duration

X

- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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- Details

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Data Type:	xbrli:stringItemType
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X

- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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X

- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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