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Commitment and Contingencies (Details) (Unfavorable Regulatory Action [Member]) | 12 Months Ended
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Dec. 31, 2011
Unfavorable Regulatory Action [Member] |
Loss Contingencies [Line Items] |
Loss Contingency Range Of Possible Loss Maximum Percent | 1.00%

X
- Definition Loss Contingency, Range Of Possible Loss (Maximum) as a Percent of Total Worldwide Revenues. + References No definition available. + Details
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Namespace Prefix: | mmsi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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