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Royalty Agreements (Details) (BioSphere APHP Royalty, USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
BioSphere APHP Royalty |  |  |
Royalty Agreements [Line Items] |  |  |
Current Royalty Rate | 5.00%mmsi_CurrentRoyaltyRate / mmsi_RoyaltyAgreementsAxis = mmsi_BiosphereAphpRoyaltyMember |  |
Future Royalty Rate | 2.50%mmsi_FutureRoyaltyRate / mmsi_RoyaltyAgreementsAxis = mmsi_BiosphereAphpRoyaltyMember |  |
Royalty Expense | $ 1.5 us-gaap_RoyaltyExpense / mmsi_RoyaltyAgreementsAxis = mmsi_BiosphereAphpRoyaltyMember | $ 1.3 us-gaap_RoyaltyExpense / mmsi_RoyaltyAgreementsAxis = mmsi_BiosphereAphpRoyaltyMember | $ 1.4 us-gaap_RoyaltyExpense / mmsi_RoyaltyAgreementsAxis = mmsi_BiosphereAphpRoyaltyMember

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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

X
- 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

X
- Details
Name: | mmsi_RoyaltyAgreementsLineItems
Namespace Prefix: | mmsi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_RoyaltyExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration