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STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
STATEMENTS OF STOCKHOLDERS' EQUITY |  |  |
Shares returned as payment for stock options converted | 15,572 | 12,634 | 12,446

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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_StatementOfStockholdersEquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration