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Consolidated Statements of Stockholders’ Equity (Parentheticals) (Common Stock [Member])	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Common Stock [Member]
Common stock, shares issued	11,266mlab_StockIssuedDuringPeriodSharesWithheldForPaymentStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	13,021mlab_StockIssuedDuringPeriodSharesWithheldForPaymentStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	15,572mlab_StockIssuedDuringPeriodSharesWithheldForPaymentStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember

X

- Definition

Represents shares returned as payment for stock options exercised and converted into shares of common stock.

+ References

No definition available.

+ Details

Name:	mlab_StockIssuedDuringPeriodSharesWithheldForPaymentStockOptionsExercised
Namespace Prefix:	mlab_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration