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Consolidated Statements of Stockholders' Equity (Parentheticals) - shares | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Common Stock [Member] |  |  |
Common stock, shares returned as payment (in shares) | 8,562 | 13,964 | 13,491

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- Definition Represents shares returned as payment for stock options exercised and converted into shares of common stock. + References No definition available. + Details
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Namespace Prefix: | mlab_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |