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Subsequent Events - Narrative (Details) - Subsequent Event - NinePoint $ in Millions | 1 Months Ended
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Apr. 30, 2018 USD ($)
Subsequent Event [Line Items] |
Option to purchase outstanding equity, up to | 100.00%
Long-term agreement, option to purchase equity and loan issued | $ 20.5

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- Definition Business Acquisition, Option To Acquire Percentage of Voting Interests + References No definition available. + Details
Name: | mmsi_BusinessAcquisitionOptionToAcquirePercentageofVotingInterests
Namespace Prefix: | mmsi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Long-term Agreement, Option to Purchase Remaining Equity, Loan Issued for Total Consideration, Amount + References No definition available. + Details
Name: | mmsi_LongtermAgreementOptiontoPurchaseRemainingEquityLoanIssuedforTotalConsiderationAmount
Namespace Prefix: | mmsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_CounterpartyNameAxis=mmsi_NinePointMedicalInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |