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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

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

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- Details

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