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Commitments and Contingencies (Details) (USD $)			1 Months Ended	12 Months Ended
	Mar. 31, 2013 item	Mar. 31, 2012	May 31, 2012 Bios	Mar. 31, 2013 Bios	May 15, 2012 Bios
Contingencies
Earn-out period for determination of contingent consideration			3 years
Minimum revenue required in three years subsequent to the acquisition for payment of contingent consideration					$ 22,127,000
Potential undiscounted future payments, low end of range					0
Potential undiscounted future payments, high end of range					6,710,000
Contingent consideration liability	2,140,000			2,140,000
Change in contingent consideration liability				0
Estimate for state sales taxes recorded	$ 100,000	$ 250,000
Number of states with estimated sales tax due	1

X

- Definition

Represents the earn-out period over which the revenue growth will be assessed to determine the contingent consideration payable.

+ References

No definition available.

+ Details

Name:	mlab_BusinessAcquisitionEarnOutPeriodForDeterminationOfContingentConsideration
Namespace Prefix:	mlab_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the minimum revenue required in three years subsequent to the acquisition for payment of contingent consideration.

+ References

No definition available.

+ Details

Name:	mlab_BusinessAcquisitionMinimumRevenueRequiredInThreeYearsSubsequentToAcquisitionForPaymentOfContingentConsideration
Namespace Prefix:	mlab_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The increase (decrease) in the amount of liabilities assumed that arise from contingencies and were recognized by the entity.

+ References

No definition available.

+ Details

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

X

- Definition

This element represents the number of states to which the company has an estimated state sales tax due for the reporting period.

+ References

No definition available.

+ Details

Name:	mlab_NumberOfStatesDueSalesTax
Namespace Prefix:	mlab_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the amount of sales tax recorded.

+ References

No definition available.

+ Details

Name:	mlab_ProvisionForStateSalesTaxes
Namespace Prefix:	mlab_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_BusinessAcquisitionContingentConsiderationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph g

-Clause 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph g

-Clause 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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

X

- Definition

The amount, measured at acquisition-date fair value, of all liabilities assumed that arise from contingencies and were recognized by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

+ Details

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