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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

X

- 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

X

- Details

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