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Note 12 - Income Taxes - Change in Gross Balance of Unrecognized Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Beginning balance	$ 64	$ 653	$ 1,361
Increase (decreases) related to prior period tax positions	1,179	(629)	(1,027)
Increases related to current period tax positions	86	40	319
Ending balance	$ 1,329	$ 64	$ 653

X

- Definition

Amount of increase (decrease) in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
-URI https://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319

+ Details

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

X

- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(2)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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