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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