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Derivatives - Foreign Currency Forward Contracts (Details)
In Thousands, unless otherwise specified
0 Months Ended 0 Months Ended
Feb. 27, 2015
30 Day Forward Contract EURO
Feb. 27, 2015
30 Day Forward Contract EURO
EUR (€)
Feb. 27, 2015
30 Day Forward Contract GBP
Feb. 27, 2015
30 Day Forward Contract GBP
GBP (£)
Derivatives, Fair Value [Line Items]        
Forward Contract Term 30 days   30 days  
Derivative, Notional Amount   € 309invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= mmsi_A30DayForwardContractEuroMember
  £ 257invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= mmsi_A30DayForwardContractGbpMember