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Note 5 - Goodwill and Intangible Assets (Details) - Change in the Carrying Amount of Goodwill (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Goodwill [Line Items] |  |
Goodwill | $ 37,866 us-gaap_Goodwill | $ 23,640 us-gaap_Goodwill
Acquisitions | 7,003 us-gaap_GoodwillAcquiredDuringPeriod | 14,226 us-gaap_GoodwillAcquiredDuringPeriod
Goodwill | 44,869 us-gaap_Goodwill | 37,866 us-gaap_Goodwill
Biological Indicators [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 9,279 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember | 9,279 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember
Acquisitions | 3,708 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember |
Goodwill | 12,987 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember | 9,279 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlab_BiologicalIndicatorsMember
Instruments [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 14,940 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember | 14,361 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember
Acquisitions | 3,295 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember | 579 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember
Goodwill | 18,235 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember | 14,940 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlab_InstrumentsMember
Continuous Monitoring [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 13,647 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember |
Acquisitions |  | 13,647 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember
Goodwill | $ 13,647 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember | $ 13,647 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mlab_ContinuousMonitoringMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mlab_BiologicalIndicatorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mlab_ContinuousMonitoringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mlab_InstrumentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |