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Credit Agreement - Additional Information (Details) (USD $) | 3 Months Ended |  |  |
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Mar. 31, 2015 | Sep. 30, 2013 | Nov. 05, 2014 | Nov. 04, 2014
Line of Credit [Member] | Revolving Credit Facility [Member] | Wells Fargo Bank, National Association [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility with a letter of credit sub limit |  | $ 75,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = omcl_WellsFargoBankNationalAssociationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Line of Credit [Member] | Letter of Credit [Member] | Wells Fargo Bank, National Association [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility with a letter of credit sub limit |  | 10,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = omcl_WellsFargoBankNationalAssociationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Increases in to aggregate commitments (does not exceed $25 million) |  | 25,000,000 omcl_LineofCreditFacilityAdditionalBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = omcl_WellsFargoBankNationalAssociationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |
Commitment fee percentage | 0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = omcl_WellsFargoBankNationalAssociationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |
Eurodollar [Member] | Line of Credit [Member] | Letter of Credit [Member] | Wells Fargo Bank, National Association [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amounts drawn under the Credit Agreements bears interest rate | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = omcl_WellsFargoBankNationalAssociationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |  |  |
Federal Funds Effective Swap Rate [Member] | Line of Credit [Member] | Letter of Credit [Member] | Wells Fargo Bank, National Association [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amounts drawn under the Credit Agreements bears interest rate | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = omcl_WellsFargoBankNationalAssociationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember / us-gaap_VariableRateAxis = us-gaap_FederalFundsEffectiveSwapRateMember |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member] | Letter of Credit [Member] | Wells Fargo Bank, National Association [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amounts drawn under the Credit Agreements bears interest rate | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = omcl_WellsFargoBankNationalAssociationMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |
November 2014 Stock Repurchase Program [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Authorized amount of repurchase of common stock |  |  | $ 50,000,000 omcl_StockRepurchaseProgramAuthorizedAnnualAmount / us-gaap_ShareRepurchaseProgramAxis = omcl_November2014StockRepurchaseProgramMember | $ 25,000,000 omcl_StockRepurchaseProgramAuthorizedAnnualAmount / us-gaap_ShareRepurchaseProgramAxis = omcl_November2014StockRepurchaseProgramMember

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- Definition Line of Credit Facility, Additional Borrowing Capacity + References No definition available. + Details
Name: | omcl_LineofCreditFacilityAdditionalBorrowingCapacity
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Stock Repurchase Program, Authorized Annual Amount + References No definition available. + Details
Name: | omcl_StockRepurchaseProgramAuthorizedAnnualAmount
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=omcl_November2014StockRepurchaseProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_FederalFundsEffectiveSwapRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |