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Description of Business and Summary of Significant Accounting Policies (Details 4)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Goodwill and intangible assets
Number of categories of intangible assets	3
Intangible assets excluding trade names | Minimum
Goodwill and intangible assets
Estimated useful life	3 years
Intangible assets excluding trade names | Maximum
Goodwill and intangible assets
Estimated useful life	16 years
Trade names
Goodwill and intangible assets
Estimated useful life	10 years	10 years

X

- Definition

Represents the number of categories in which intangible assets are classified by the entity.

+ References

No definition available.

+ Details

Name:	mlab_NumberOfCategoriesOfIntangibleAssets
Namespace Prefix:	mlab_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration