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Derivatives - Foreign Currency Forward Contracts (Details) In Thousands, unless otherwise specified | 0 Months Ended
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Feb. 28, 2014 30 Day Forward Contract EURO EUR (€) | Feb. 28, 2014 30 Day Forward Contract GBP GBP (£)
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | € 966 | £ 652
Forward Contract Term | 30 days | 30 days

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Forward Contract Term + References No definition available. + Details
Name: | mmsi_ForwardContractTerm
Namespace Prefix: | mmsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration