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Goodwill and Other Intangible Assets (Other Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Jan. 03, 2012 | Dec. 31, 2014 | Jan. 03, 2013 | Jan. 03, 2014 | Jan. 05, 2015
Other Intangible Assets [Line Items] |  |  |  |  |
Up-front payment | $ 63.0 cnmd_JointDevelopmentAndDistributionAgreementUpFrontPayment |  |  |  |
Contingent payment period | 4 years |  |  |  |
Additional contingent cash payment | 84.0 cnmd_JointDevelopmentAndDistributionAgreementConditionalPaymentAmount |  |  |  |
Conditional payment amount accrued |  | 33.4 cnmd_JointDevelopmentAndDistributionAgreementConditionalPaymentAmountAccrued |  |  |
After One Year of Meeting Supply Target [Member] |  |  |  |  |
Other Intangible Assets [Line Items] |  |  |  |  |
Conditional payment, amount paid |  |  | 34.0 cnmd_JointDevelopmentAndDistributionAgreementConditionalPaymentAmountPaid / cnmd_SupplyTargetAxis = cnmd_AfterOneYearOfMeetingSupplyTargetMember |  |
After Two Year of Meeting Supply Target [Member] |  |  |  |  |
Other Intangible Assets [Line Items] |  |  |  |  |
Conditional payment, amount paid |  |  |  | 16.7 cnmd_JointDevelopmentAndDistributionAgreementConditionalPaymentAmountPaid / cnmd_SupplyTargetAxis = cnmd_AfterTwoYearofMeetingSupplyTargetMember |
After Year Four of Meeting Supply Target [Member] |  |  |  |  |
Other Intangible Assets [Line Items] |  |  |  |  |
Additional contingent cash payment |  | 16.7 cnmd_JointDevelopmentAndDistributionAgreementConditionalPaymentAmount / cnmd_SupplyTargetAxis = cnmd_AfterYearFourofMeetingSupplyTargetMember |  |  |
Subsequent Event [Member] | After Year Three of Meeting Supply Target [Member] |  |  |  |  |
Other Intangible Assets [Line Items] |  |  |  |  |
Conditional payment, amount paid |  |  |  |  | $ 16.7 cnmd_JointDevelopmentAndDistributionAgreementConditionalPaymentAmountPaid / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / cnmd_SupplyTargetAxis = cnmd_AfterYearThreeofMeetingSupplyTargetMember

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- Definition Joint Development and Distribution Agreement, Conditional Payment Amount + References No definition available. + Details
Name: | cnmd_JointDevelopmentAndDistributionAgreementConditionalPaymentAmount
Namespace Prefix: | cnmd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Joint Development and Distribution Agreement, Conditional Payment Amount Accrued + References No definition available. + Details
Name: | cnmd_JointDevelopmentAndDistributionAgreementConditionalPaymentAmountAccrued
Namespace Prefix: | cnmd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Joint Development and Distribution Agreement, Conditional Payment, Amount Paid + References No definition available. + Details
Name: | cnmd_JointDevelopmentAndDistributionAgreementConditionalPaymentAmountPaid
Namespace Prefix: | cnmd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Joint Development and Distribution Agreement, Conditional Payment Period + References No definition available. + Details
Name: | cnmd_JointDevelopmentAndDistributionAgreementConditionalPaymentPeriod
Namespace Prefix: | cnmd_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow related to the up front payment for the rights and certain assets under the joint development and distribution agreement. + References No definition available. + Details
Name: | cnmd_JointDevelopmentAndDistributionAgreementUpFrontPayment
Namespace Prefix: | cnmd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | cnmd_OtherIntangibleAssetsLineItems
Namespace Prefix: | cnmd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | cnmd_SupplyTargetAxis=cnmd_AfterOneYearOfMeetingSupplyTargetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | cnmd_SupplyTargetAxis=cnmd_AfterTwoYearofMeetingSupplyTargetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | cnmd_SupplyTargetAxis=cnmd_AfterYearFourofMeetingSupplyTargetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |