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Royalty Agreements Royalty Agreements (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010
Datascope Royalty Agreement [Member] |  |
Current Royalty Rate | 5.00% |
Minimum Royalty Payment | $ 50 |
Royalty Expense | 50 |
BioSphere APHP Royalty [Member] |  |
Current Royalty Rate | 5.00% |
Future Royalty Rate | 2.50% |
Royalty Expense | $ 1,300 | $ 401

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- Definition Current Royalty Rate + References No definition available. + Details
Name: | mmsi_CurrentRoyaltyRate
Namespace Prefix: | mmsi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Future Royalty Rate + References No definition available. + Details
Name: | mmsi_FutureRoyaltyRate
Namespace Prefix: | mmsi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Minimum Royalty Payment + References No definition available. + Details
Name: | mmsi_MinimumRoyaltyPayment
Namespace Prefix: | mmsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration