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Note 2 - Acquisitions and Dispositions - Pro Forma Effects (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Infitrak Acquisition [Member]
Diluted (in dollars per share)	$ 3.05	$ 2.72
Revenues	$ 86,499	$ 74,379
Net income	$ 11,471	$ 9,944
Basic (in dollars per share)	$ 3.18	$ 2.82
North Bay Acquisition [Member]
Diluted (in dollars per share)	$ 3.05	$ 2.79
Revenues	$ 86,053	$ 75,649
Net income	$ 11,463	$ 10,182
Basic (in dollars per share)	$ 3.18	$ 2.89
PCD Acquisition [Member]
Diluted (in dollars per share)		$ 2.65	$ 2.63
Revenues		$ 73,068	$ 56,541
Net income		$ 9,673	$ 9,512
Basic (in dollars per share)		$ 2.75	$ 2.76
BGI [Member]
Diluted (in dollars per share)		$ 2.65	$ 3.09
Revenues		$ 71,648	$ 60,388
Net income		$ 9,661	$ 11,141
Basic (in dollars per share)		$ 2.74	$ 3.23

X

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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X

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mlab_NorthBayAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mlab_PCDAcquisitionMember
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X

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