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Derivatives - Foreign Currency Forward Contracts (Details) € in Thousands, £ in Thousands | Feb. 27, 2015 | Aug. 31, 2015 GBP (£) | Aug. 31, 2015 EUR (€)
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30 Day Forward Contract EURO |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Forward Contract Term | 30 days |  |
Derivative, Notional Amount |  |  | € 160
30 Day Forward Contract GBP |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Forward Contract Term | 30 days |  |
Derivative, Notional Amount | £ |  | £ 355 |

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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
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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
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Namespace Prefix: | mmsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |