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Debt and Credit Agreements - Narrative (Details) - USD ($)		12 Months Ended
	Jan. 05, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 26, 2017	Apr. 11, 2017
Debt Instrument [Line Items]
Amortization of debt financing fees		$ 2,292,000	$ 1,590,000	$ 1,590,000
Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Debt issuance cost, Amended Credit Agreement		0	2,106,000
Interest expense		7,500,000	6,300,000	5,300,000
Amortization of debt financing fees		2,292,000	1,600,000	$ 1,600,000
Carrying amount of debt		140,000,000	217,000,000
Long-term debt, fair value		$ 143,500,000
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit
Debt Instrument [Line Items]
Line of Credit Facility	$ 400,000,000
Annual capital expenditure limitation per Credit Agreement	35,000,000.0					$ 45,000,000.0
Maximum allowed non-permitted investments per Credit Agreement	$ 10,000,000.0					$ 20,000,000.0
Debt issuance cost			(10,100,000)
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option One | LIBOR | Min
Debt Instrument [Line Items]
Amounts draw under the Credit Agreements bears interest rate	1.50%
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option One | LIBOR | Max
Debt Instrument [Line Items]
Amounts draw under the Credit Agreements bears interest rate	2.25%
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option Two | LIBOR | Min
Debt Instrument [Line Items]
Amounts draw under the Credit Agreements bears interest rate	0.50%
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option Two | LIBOR | Max
Debt Instrument [Line Items]
Amounts draw under the Credit Agreements bears interest rate	1.25%
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option Two | Federal Funds
Debt Instrument [Line Items]
Amounts draw under the Credit Agreements bears interest rate	0.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, term (in years)		5 years
Revolving Credit Facility | Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Carrying amount of debt		$ 0	34,500,000
Revolving Credit Facility | Wells Fargo Bank, National Association | Line of Credit
Debt Instrument [Line Items]
Line of Credit Facility	$ 200,000,000				$ 315,000,000
Debt instrument, term (in years)	5 years
Revolving Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Min
Debt Instrument [Line Items]
Commitment fee percentage, unused capacity	0.20%
Revolving Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Max
Debt Instrument [Line Items]
Commitment fee percentage, unused capacity	0.35%
Term Loan Facility
Debt Instrument [Line Items]
Debt instrument, term (in years)		5 years
Term Loan Facility | Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Carrying amount of debt		$ 140,000,000	$ 182,500,000
Term Loan Facility | Wells Fargo Bank, National Association | Line of Credit
Debt Instrument [Line Items]
Line of Credit Facility	$ 200,000,000
Debt instrument, term (in years)	5 years
Periodic payment, principal percent years one and two	5.00%
Periodic payment, principal percent years three and four	10.00%
Periodic payment, principal percent year five	15.00%
Letter of Credit | Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Line of Credit Facility	$ 10,000,000
Letter of Credit | Wells Fargo Bank, National Association | Line of Credit | Min
Debt Instrument [Line Items]
Commitment fee percentage	1.50%
Letter of Credit | Wells Fargo Bank, National Association | Line of Credit | Max
Debt Instrument [Line Items]
Commitment fee percentage	2.25%
Swing Line Loan | Wells Fargo Bank, National Association
Debt Instrument [Line Items]
Line of Credit Facility	$ 10,000,000

X

- Definition

Annual capital expenditure limitation per Credit Agreement

+ References

No definition available.

+ Details

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

X

- Definition

Line of Credit Facility, Periodic Payment, Principal, Percent, Year Five

+ References

No definition available.

+ Details

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Namespace Prefix:	omcl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line of Credit Facility, Periodic Payment, Principal, Percent, Years One And Two

+ References

No definition available.

+ Details

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Namespace Prefix:	omcl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line of Credit Facility, Periodic Payment, Principal, Percent, Years Three And Four

+ References

No definition available.

+ Details

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Namespace Prefix:	omcl_
Data Type:	num:percentItemType
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X

- Definition

Long-term Line of Credit, Gross

+ References

No definition available.

+ Details

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

X

- Definition

Maximum allowed non-permitted investments per Credit Agreement

+ References

No definition available.

+ Details

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Namespace Prefix:	omcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Proceeds from Long-term Lines of Credit, Finance Costs

+ References

No definition available.

+ Details

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Namespace Prefix:	omcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(8))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

+ Details

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

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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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

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

X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

+ Details

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

X

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

+ Details

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

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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- Details

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