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Subsequent Events - Narrative (Details) - Subsequent Event $ in Thousands | Jul. 30, 2018 USD ($) shares
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Subsequent Event [Line Items] |
Common stock issued in transaction (in shares) | shares | 4,025,000
Net proceeds from issuance of common stock | $ 205,400
Underwriting discounts and commissions | 10,400
Other direct costs incurred | $ 500

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- Definition Payment Of Stock Issuance Costs, Other Direct Cost + References No definition available. + Details
Name: | mmsi_PaymentOfStockIssuanceCostsOtherDirectCost
Namespace Prefix: | mmsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Payment Of Stock Issuance Costs, Underwriting Discounts And Commissions + References No definition available. + Details
Name: | mmsi_PaymentOfStockIssuanceCostsUnderwritingDiscountsAndCommissions
Namespace Prefix: | mmsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |