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Note 15 - Commitments and Contingencies (Details Textual) $ in Thousands	12 Months Ended
	Mar. 31, 2021 USD ($)
GPT Acquisition [Member]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Accrued Expenses	$ 1,899
Liability for Collecting and Remitting Sales Tax [Member]
Loss Contingency Accrual, Ending Balance	2,714
Liability for Collecting and Remitting Sales Tax States with Established Nexus [Member]
Loss Contingency Accrual, Ending Balance	565
Liability for Collecting and Remitting Sales Tax States Interest Incurred [Member]
Loss Contingency Accrual, Ending Balance	$ 250

X

- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to other accrued expenses assumed in connection with a business combination for which the initial accounting was incomplete.

+ References

No definition available.

+ Details

Name:	mlab_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAccruedExpenses
Namespace Prefix:	mlab_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=mlab_LiabilityForCollectingAndRemittingSalesTaxMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=mlab_LiabilityForCollectingAndRemittingSalesTaxStatesWithEstablishedNexusMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=mlab_LiabilityForCollectingAndRemittingSalesTaxStatesInterestIncurredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: