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Note 2 - Acquisitions (Details Textual)	6 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jul. 06, 2015 CAD	Jul. 06, 2015 USD ($)	Mar. 31, 2015 USD ($)
Infitrak Acquisition [Member] | Minimum [Member] | Contingent Consideration Year 1 [Member]
Business Combination, Contingent Consideration, Sliding Scale of Growth			30.00%	30.00%
Infitrak Acquisition [Member] | Minimum [Member] | Contingent Consideration Year 2 [Member]
Business Combination, Contingent Consideration, Sliding Scale of Growth			15.00%	15.00%
Infitrak Acquisition [Member] | Maximum [Member] | Contingent Consideration Year 1 [Member]
Business Combination, Contingent Consideration, Sliding Scale of Growth			70.00%	70.00%
Infitrak Acquisition [Member] | Maximum [Member] | Contingent Consideration Year 2 [Member]
Business Combination, Contingent Consideration, Sliding Scale of Growth			75.00%	75.00%
Infitrak Acquisition [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low				$ 0
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High			CAD 15,000,000	11,500,000
Business Combination, Contingent Consideration, Liability				$ 9,541,000
Business Combination, Contingent Consideration, Payment Installments			2	2
Payments to Acquire Businesses, Net of Cash Acquired	$ 30,228,000	$ 13,817,000
Business Combination, Contingent Consideration, Liability	$ 4,480,000				$ 812,000

X

- Definition

Number of installments in which contingent consideration related to a business combination is payable in.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of sliding scale of growth in gross profit that is used to determine the amount of contingent consideration in a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	mlab_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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=35744584&loc=d3e6927-128479

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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=35744584&loc=d3e6927-128479

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X

- Definition

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

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



-SubTopic 30



-Section 35



-Paragraph 1



-Subparagraph b



-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



-SubTopic 30



-Section 25



-Paragraph 6



-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

+ Details

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

X

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 13



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585



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



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Investing Activities



-URI http://asc.fasb.org/extlink&oid=6516133

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X

- Details

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- Details

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- Details

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