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Variable Interest Entity (VIE) - Additional Information (Detail)	Jan. 02, 2007 company
Variable Interest Entity [Abstract]
Number of Companies with Rights to Intellectual Property	2

X

- Definition

Number of Companies with Rights to Intellectual Property

+ References

No definition available.

+ Details

Name:	masi_NumberofCompanieswithRightstoIntellectualProperty
Namespace Prefix:	masi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Variable Interest Entity [Abstract]

+ References

No definition available.

+ Details

Name:	masi_VariableInterestEntityAbstract
Namespace Prefix:	masi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration