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Foreign Currency Forward Contracts (Details) In Thousands, unless otherwise specified	0 Months Ended
	May 31, 2012 30 Day Forward Contract EURO [Member] EUR (€)	May 31, 2012 30 Day Forward Contract GBP [Member] GBP (£)
Derivatives, Fair Value [Line Items]
Forward Contract Term	30 days	30 days
Derivative, Notional Amount	€ 1,163	£ 351

X

- Definition

Monetary 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

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Forward Contract Term

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_DerivativesFairValueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration