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Revolving Credit Facility and Long-Term Debt - Narrative (Details) (USD $) | 12 Months Ended | 0 Months Ended |  |  |
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Dec. 31, 2014 quarter | Dec. 19, 2012 | Dec. 31, 2013 | Oct. 04, 2013 | Sep. 30, 2010
Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Current Quarter, Maximum | 4.75 mmsi_LineofCreditFacilityCovenantTermsConsolidatedTotalLeverageRatioCurrentQuarterMaximum / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Quarter One, Maximum | 4.00 mmsi_LineofCreditFacilityCovenantTermsConsolidatedTotalLeverageRatioQuarterOneMaximum / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Quarter Two, Maximum | 3.75 mmsi_LineofCreditFacilityCovenantTermsConsolidatedTotalLeverageRatioQuarterTwoMaximum / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Quarter Three, Maximum | 3.50 mmsi_LineofCreditFacilityCovenantTermsConsolidatedTotalLeverageRatioQuarterThreeMaximum / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Quarter Four, Maximum | 3.25 mmsi_LineofCreditFacilityCovenantTermsConsolidatedTotalLeverageRatioQuarterFourMaximum / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Year Two, Maximum | 3 mmsi_LineOfCreditFacilityCovenantTermsConsolidatedTotalLeverageRatioYearTwoMaximum / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Year Three, Maximum | 2.75 mmsi_LineOfCreditFacilityCovenantTermsConsolidatedTotalLeverageRatioYearThreeMaximum / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Year Four, Maximum | 2.5 mmsi_LineofCreditFacilityCovenantTermsConsolidatedTotalLeverageRatioAfterYearThreeMaximum / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated EBITDA to Fixed Charges Ratio, Number of Consecutive Quarters | 4 mmsi_LineOfCreditFacilityCovenantTermsConsolidatedEbitdaToFixedChargesRatioNumberOfConsecutiveQuarters / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated EBITDA to Fixed Charges Ratio, Minimum | 1.75 mmsi_LineOfCreditFacilityCovenantTermsConsolidatedEbitdaToFixedChargesRatioMinimum / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Net Income, Maximum | $ 0 mmsi_LineOfCreditFacilityCovenantTermsConsolidatedNetIncomeMaximum / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |  |
Line of Credit Facility, Covenant Terms, Facility Capital Expenditures, Next Twelve Months, Maximum | 30,000,000 mmsi_LineOfCreditFacilityCovenantTermsFacilityCapitalExpendituresNextTwelveMonthsMaximum / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |  |
Line of Credit Facility, Amount Outstanding | 224,500,000 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 27,500,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | 2.9825%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  | 4.2325%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |
Long-term Debt, Percentage Bearing Fixed Interest, Amount | 140,000,000 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  | 145,000,000 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |
Base Rate | Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember | 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Minimum | 2.25 mmsi_LineOfCreditFacilityCovenantTermsConsolidatedTotalLeverageRatioMinimum / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |  |
London Interbank Offered Rate (LIBOR) Market Index Rate | Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = mmsi_LondonInterbankOfferedRateLiborMarketIndexRateMember | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = mmsi_LondonInterbankOfferedRateLiborMarketIndexRateMember |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Minimum | 2.25 mmsi_LineOfCreditFacilityCovenantTermsConsolidatedTotalLeverageRatioMinimum / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = mmsi_LondonInterbankOfferedRateLiborMarketIndexRateMember |  |  |  |
London Interbank Offered Rate (LIBOR) | Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Minimum | 2.25 mmsi_LineOfCreditFacilityCovenantTermsConsolidatedTotalLeverageRatioMinimum / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Debt Instrument, Basis Spread on Base Rate | 0.01 mmsi_DebtInstrumentBasisSpreadOnBaseRate / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Federal Funds Rate | Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Base Rate | 0.0050 mmsi_DebtInstrumentBasisSpreadOnBaseRate / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = mmsi_FederalFundsRateMember |  |  |  |
Variable Rate 1 | Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate | 2.17%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = mmsi_VariableRate1Member |  | 3.42%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = mmsi_VariableRate1Member |  |
Long-term Debt, Percentage Bearing Variable Interest, Amount | 84,300,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = mmsi_VariableRate1Member |  | 101,500,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = mmsi_VariableRate1Member |  |
Variable Rate 2 | Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate | 2.26%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = mmsi_VariableRate2Member |  | 3.50%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = mmsi_VariableRate2Member |  |
Long-term Debt, Percentage Bearing Variable Interest, Amount | 174,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = mmsi_VariableRate2Member |  | 2,400,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = mmsi_VariableRate2Member |  |
Revolving Credit Facility | Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 215,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |
Revolving Credit Facility | Wells Fargo |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 175,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = mmsi_WellsFargoMember
Term Loan | Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 100,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = mmsi_TermLoanMember / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember |  |  |
Bridge Loan | Base Rate | Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Minimum | 2.25 mmsi_LineOfCreditFacilityCovenantTermsConsolidatedTotalLeverageRatioMinimum / us-gaap_CreditFacilityAxis = us-gaap_BridgeLoanMember / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |  |
Bridge Loan | London Interbank Offered Rate (LIBOR) Market Index Rate | Credit Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_BridgeLoanMember / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = mmsi_LondonInterbankOfferedRateLiborMarketIndexRateMember | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_BridgeLoanMember / us-gaap_DebtInstrumentAxis = mmsi_CreditAgreementMember / us-gaap_VariableRateAxis = mmsi_LondonInterbankOfferedRateLiborMarketIndexRateMember |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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