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Acquisitions - Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 04, 2013 | Jan. 31, 2012 | Nov. 19, 2012 | Dec. 19, 2012
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Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 184,464 us-gaap_Goodwill | $ 184,505 us-gaap_Goodwill | $ 175,108 us-gaap_Goodwill |  |  |  |
Radial Assist |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Inventories |  |  |  | 16 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mmsi_RadialAssistMember |  |  |
Goodwill |  |  |  | 904 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mmsi_RadialAssistMember |  |  |
Total assets acquired |  |  |  | 2,500 mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = mmsi_RadialAssistMember |  |  |
Datascope |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Inventories |  |  |  | 478 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mmsi_DatascopeMember |  |  |
Goodwill |  |  |  | 8,112 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mmsi_DatascopeMember |  |  |
Total assets acquired |  |  |  | 27,500 mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = mmsi_DatascopeMember |  |  |
Ostial Solutions, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  | 9,580 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mmsi_OstialSolutionsLlcMember |  |
Total assets acquired |  |  |  |  | 20,800 mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = mmsi_OstialSolutionsLlcMember |  |
MediGroup |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Inventories |  |  |  |  |  | 263 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mmsi_MedigroupMember |
Property and equipment |  |  |  |  |  | 79 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mmsi_MedigroupMember |
Goodwill |  |  |  |  |  | 1,697 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mmsi_MedigroupMember |
Total assets acquired |  |  |  |  |  | 4,439 mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = mmsi_MedigroupMember |
Thomas Medical Products, Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Trade receivables |  |  |  |  |  |  | 6,507 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember
Inventories |  |  |  |  |  |  | 5,459 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember
Prepaid expenses |  |  |  |  |  |  | 340 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember
Property and equipment |  |  |  |  |  |  | 2,685 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember
Goodwill |  |  |  |  |  |  | 102,407 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember
Total assets acquired |  |  |  |  |  |  | 167,298 mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember
Accounts payable |  |  |  |  |  |  | 588 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember
Accrued expenses |  |  |  |  |  |  | 1,094 mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpenses / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember
Total liabilities assumed |  |  |  |  |  |  | 1,682 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember
Net assets acquired, net of cash acquired |  |  |  |  |  |  | 165,616 mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember
Cash acquired |  |  |  |  |  |  | 1,829 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember
Developed technology | Radial Assist |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  | 1,520 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_RadialAssistMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  |  |
Developed technology | Datascope |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  | 18,200 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_DatascopeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  |  |
Developed technology | Ostial Solutions, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  |  | 10,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_OstialSolutionsLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  |
Developed technology | MediGroup |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  |  |  | 2,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_MedigroupMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Developed technology | Thomas Medical Products, Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  | 43,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Customer lists | Radial Assist |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  | 20 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_RadialAssistMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  |  |
Customer lists | Datascope |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  | 390 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_DatascopeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  |  |
Customer lists | Ostial Solutions, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  |  | 600 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_OstialSolutionsLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |  |
Customer lists | MediGroup |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  |  |  | 110 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_MedigroupMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |
Customer lists | Thomas Medical Products, Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  | 5,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Trademarks | Radial Assist |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  | 40 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_RadialAssistMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |
Trademarks | Datascope |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  | 320 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_DatascopeMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |
Trademarks | Ostial Solutions, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  |  | 110 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_OstialSolutionsLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |
Trademarks | MediGroup |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  |  |  | 80 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_MedigroupMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |
Trademarks | Thomas Medical Products, Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  | 1,400 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Non-compete agreements | Ostial Solutions, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  |  | 10 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_OstialSolutionsLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |
Non-compete agreements | MediGroup |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  |  |  | 210 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_MedigroupMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |
Non-compete agreements | Thomas Medical Products, Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  | $ 500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = mmsi_ThomasMedicalProductsIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition The amount of inventory recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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