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Commitments and Contingencies Commitments and Contigenties Details (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Commitments and Contingencies Disclosure [Abstract] |  |  |
Operating Leases, Rent Expense | $ 4,100,000 | $ 3,700,000 | $ 2,800,000
Letters of Credit Outstanding, Amount | 88,000 |  |
Irish Grants Related to Reasearch and Development, Training and Hiring | 261,000 | 40,000 | 177,000
Deferred Credits and Other Liabilities | 2,000,000 | 1,800,000 |
Irish Grants Related to Purchased Property Plant and Equipment | 106,000 | 111,000 | 120,000
Refundable Irish Grants if Operations Cease | $ 500,000 |  |
FDA Warning Letter Unfavorable Regulatory Action [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency, Range Of Possible Revenue Loss, Maximum, Percent | 1.00% |  |

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- Definition Irish Goverment Grants related to reasearch and development, training and hiring. + References No definition available. + Details
Name: | mmsi_Grantsrelatedtoreasearchanddevelopmenttraininghiring
Namespace Prefix: | mmsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Irish Grants Related to Purchased Property Plant and Equipement + References No definition available. + Details
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Namespace Prefix: | mmsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Loss Contingency, Range Of Possible Loss (Maximum) as a Percent of Total Worldwide Revenues. + References No definition available. + Details
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- Definition Refundable Irish Grants if Operations Cease + References No definition available. + Details
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Namespace Prefix: | mmsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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- Definition Total carrying amount as of the balance sheet date of unearned revenue or income, not otherwise specified in the taxonomy, which is expected to be taken into income in future periods and obligations not separately disclosed in the balance sheet (other liabilities). + References No definition available. + Details
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Balance Type: | credit
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- Definition Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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