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Note 2 - Acquisitions and Dispositions (Details) (USD $)	12 Months Ended			1 Months Ended	0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	May 31, 2015	Aug. 12, 2013	Oct. 15, 2014	Nov. 06, 2013	May 15, 2012	Apr. 15, 2014
Note 2 - Acquisitions and Dispositions (Details) [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 20,543,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	$ 22,758,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	$ 16,660,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Business Combination, Contingent Consideration, Liability	812,000us-gaap_BusinessCombinationContingentConsiderationLiability	1,620,000us-gaap_BusinessCombinationContingentConsiderationLiability
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		(1,020,000)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Proceeds from Divestiture of Businesses		661,000us-gaap_ProceedsFromDivestitureOfBusinesses
Subsequent Event [Member] | Bios [Member]
Note 2 - Acquisitions and Dispositions (Details) [Line Items]
Payments for Previous Acquisition				1,120,000us-gaap_PaymentsForPreviousAcquisition / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Scenario, Previously Reported [Member] | Bios [Member]
Note 2 - Acquisitions and Dispositions (Details) [Line Items]
Business Combination, Contingent Consideration, Liability								2,140,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Nusonics Product Line Business [Member]
Note 2 - Acquisitions and Dispositions (Details) [Line Items]
Proceeds from Divestiture of Businesses					661,000us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mlab_NusonicsProductLineBusinessMember
Disposal Group Not Discontinued Operation Carrying Value					193,000mlab_DisposalGroupNotDiscontinuedOperationCarryingValue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mlab_NusonicsProductLineBusinessMember
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax					468,000us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mlab_NusonicsProductLineBusinessMember
Minimum [Member] | PCD Acquisition [Member]
Note 2 - Acquisitions and Dispositions (Details) [Line Items]
Business Acquisition Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration						9,900,000mlab_BusinessAcquisitionRevenueRequiredInThreeYearsSubsequentToAcquisitionForPaymentOfContingentConsideration / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum [Member] | Amega Scientific Corporation [Member]
Note 2 - Acquisitions and Dispositions (Details) [Line Items]
Business Acquisition Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration							31,625,000mlab_BusinessAcquisitionRevenueRequiredInThreeYearsSubsequentToAcquisitionForPaymentOfContingentConsideration / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] | PCD Acquisition [Member]
Note 2 - Acquisitions and Dispositions (Details) [Line Items]
Business Acquisition Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration						12,600,000mlab_BusinessAcquisitionRevenueRequiredInThreeYearsSubsequentToAcquisitionForPaymentOfContingentConsideration / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | Amega Scientific Corporation [Member]
Note 2 - Acquisitions and Dispositions (Details) [Line Items]
Business Acquisition Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration							43,500,000mlab_BusinessAcquisitionRevenueRequiredInThreeYearsSubsequentToAcquisitionForPaymentOfContingentConsideration / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember / us-gaap_RangeAxis = us-gaap_MaximumMember
PCD Acquisition [Member]
Note 2 - Acquisitions and Dispositions (Details) [Line Items]
Business Acquisition Agreement Holdback Payment Period from Effective Date Less Any Losses Incurred by Buyer Payable to Seller						3 years
Business Acquisition Earn Out Period for Determination of Contingent Consideration						1 year
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low						0us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High						1,500,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Business Combination, Contingent Consideration, Liability						300,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net						5,550,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_PCDAcquisitionMember
BGI [Member]
Note 2 - Acquisitions and Dispositions (Details) [Line Items]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net									10,268,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_BGIMember
Amega Scientific Corporation [Member]
Note 2 - Acquisitions and Dispositions (Details) [Line Items]
Business Acquisition Agreement Holdback Payment Period from Effective Date Less Any Losses Incurred by Buyer Payable to Seller							3 years
Business Acquisition Earn Out Period for Determination of Contingent Consideration							3 years
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low							0us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember	0us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High							10,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember	10,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember
Business Combination, Contingent Consideration, Liability							500,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net							12,768,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_AmegaScientificCorporationMember
TempSys [Member]
Note 2 - Acquisitions and Dispositions (Details) [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired							16,660,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net							9,826,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_TempSysMember
Bios [Member]
Note 2 - Acquisitions and Dispositions (Details) [Line Items]
Business Acquisition Earn Out Period for Determination of Contingent Consideration							3 years
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low								0us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueLow / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High								6,710,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember
Business Acquisition Revenue Required in Three Years Subsequent to Acquisition for Payment of Contingent Consideration								22,127,000mlab_BusinessAcquisitionRevenueRequiredInThreeYearsSubsequentToAcquisitionForPaymentOfContingentConsideration / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember
Business Combination, Contingent Consideration, Liability		1,120,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember						2,140,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net								18,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		$ 1,020,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = mlab_BiosMember

X

- Definition

Represents the holdback payment period from the effective date, less any losses incurred by buyer, payable to seller, as defined in the agreement.

+ References

No definition available.

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X

- Definition

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+ References

No definition available.

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- Definition

Represents the cumulative revenue required based upon a sliding scale of three years subsequent to the acquisition for payment of contingent consideration.

+ References

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- Definition

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+ References

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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

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-Publisher FASB

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-Paragraph 4

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X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

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- Definition

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

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- Definition

Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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- Definition

Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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- Definition

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+ References

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+ Details

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- Definition

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-Publisher FASB

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- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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