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Acquisitions - Narrative (Details) (USD $) | 3 Months Ended | 5 Months Ended | 0 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Aug. 08, 2014
Business Acquisition [Line Items] |  |  |  |
Payments to acquire intangible assets | $ 495,000 us-gaap_PaymentsToAcquireIntangibleAssets | $ 433,000 us-gaap_PaymentsToAcquireIntangibleAssets | $ 3,000,000 us-gaap_PaymentsToAcquireIntangibleAssets |
Liabilities incurred in agreement |  |  | 1,000,000 mmsi_FinitelivedIntangibleAssetsAcquiredLiabilitiesIncurred |
Contingent consideration, liability |  |  |  | 3,000,000 us-gaap_BusinessCombinationContingentConsiderationLiability
Payments to acquire businesses, net of cash acquired | 1,250,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |
License agreements and trademarks |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets purchased | 6,888,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember |  | 7,172,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember |
Useful life |  |  |  | 12 years
Distribution agreements |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets purchased | 3,205,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DistributionRightsMember |  | 3,091,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DistributionRightsMember |
Useful life |  |  |  | 3 years
Intangible assets |  |  |  | 200,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DistributionRightsMember
Developed technology |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets purchased | 76,237,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  | 79,172,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Intangible assets |  |  |  | 3,800,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Catheter Connections, Inc. [Member] | Distribution agreements |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to acquire intangible assets | 250,000 us-gaap_PaymentsToAcquireIntangibleAssets / us-gaap_CounterpartyNameAxis = mmsi_CatheterConnectionsInc.Member / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DistributionRightsMember |  |  |
Intangible assets purchased | $ 250,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_CounterpartyNameAxis = mmsi_CatheterConnectionsInc.Member / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DistributionRightsMember |  |  |
Useful life | 10 years |  |  |

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