Recent Accounting Pronouncements (Details)	Sep. 30, 2012
Recent Accounting Pronouncements [Abstract]
More Than Likely Threshold	50.00%

If the qualitative assessment results in a more than 50% likely result that the fair value of a reporting unit is less than the carrying amount, then the entity must continue to apply the two-step impairment test

No definition available.

Name:	mmsi_MoreThanLikelyThreshold
Namespace Prefix:	mmsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant