The percentage points added to the reference rate used to calculate commercial bank floating rate (CBFR).

No definition available.

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

- Definition

Represents the fixed charge coverage ratio required to be maintained by the entity under the terms of debt arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	mlab_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the ratio of funded debt to EBITDA, required to be maintained under the terms of debt arrangements.

+ References

No definition available.

+ Details

Name:	mlab_DebtInstrumentCovenantRatioOfFundedDebtToConsolidatedEBITDA
Namespace Prefix:	mlab_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of quarterly periodic payments on a line of credit facility.

+ References

No definition available.

+ Details

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

- Definition

Represents the high end of the defined tiers of ratio of funded debt to EBITDA used to determine applicable interest rate adjustments and unused capacity fees.

+ References

No definition available.

+ Details

Name:	mlab_LineOfCreditFacilityUnusedCapacityFeeRatioOfFundedDebtToEBITDAHighEndOfRange
Namespace Prefix:	mlab_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the low end of the defined tiers of ratio of funded debt to EBITDA used to determine applicable interest rate adjustments and unused capacity fees.

+ References

No definition available.

+ Details

Name:	mlab_LineOfCreditFacilityUnusedCapacityFeeRatioOfFundedDebtToEBITDALowEndOfRange
Namespace Prefix:	mlab_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	mlab_Note6LongTermDebtDetailsLineItems
Namespace Prefix:	mlab_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Amount of the required periodic payment applied to principal.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_RepaymentsOfLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Namespace Prefix:
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Balance Type:
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- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
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Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
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Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
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- Details

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Note 6 - Long-Term Debt (Details) (USD $)	12 Months Ended	1 Months Ended
Note 6 - Long-Term Debt (Details) (USD $)	Mar. 31, 2015	Feb. 29, 2012	Apr. 30, 2014
Note 6 - Long-Term Debt (Details) [Line Items]
Long-term Line of Credit (in Dollars)	16,500,000us-gaap_LineOfCredit
Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Line of Credit [Member]
Note 6 - Long-Term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Minimum [Member] \| Debt Instrument Variable Rate Base CBFR Using One Month LIBOR [Member] \| Line of Credit [Member]
Note 6 - Long-Term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	(1.25%)
Minimum [Member] \| Line of Credit [Member]
Note 6 - Long-Term Debt (Details) [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.15%
Line of Credit Facility, Unused Capacity Fee Ratio of Funded Debt to EBITDA High End of Range	2
Debt Instrument Covenant Fixed Charge Coverage Ratio	1.35
Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Line of Credit [Member]
Note 6 - Long-Term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Maximum [Member] \| Debt Instrument Variable Rate Base CBFR Using One Month LIBOR [Member] \| Line of Credit [Member]
Note 6 - Long-Term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	(0.50%)
Maximum [Member] \| Line of Credit [Member]
Note 6 - Long-Term Debt (Details) [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.30%
Line of Credit Facility Unused Capacity Fee Ratio of Funded Debt to EBITDA Low End of Range	1
London Interbank Offered Rate (LIBOR) [Member] \| Term Loan [Member]
Note 6 - Long-Term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Debt Instrument Variable Rate Base CBFR Using One Month LIBOR [Member] \| Line of Credit [Member]
Note 6 - Long-Term Debt (Details) [Line Items]
Debt Instrument Basis Spread on Variable Rate Used to Calculate Commercial Bank Floating Rate	2.50%
Line of Credit [Member]
Note 6 - Long-Term Debt (Details) [Line Items]
Debt Instrument, Term		3 years
Debt Instrument Covenant Ratio of Funded Debt to Consolidated EBIDTA	2.5
Revolving Credit Facility [Member]
Note 6 - Long-Term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)		20,000,000
Repayments of Lines of Credit (in Dollars)	500,000
Letter of Credit [Member]
Note 6 - Long-Term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)		1,000,000
Term Loan [Member]
Note 6 - Long-Term Debt (Details) [Line Items]
Long-term Debt, Gross (in Dollars)			15,000,000
Line of Credit Facility, Periodic Payment, Number of Quarterly Payments	11
Line of Credit Facility, Periodic Payment, Principal (in Dollars)	750,000
Repayments of Long-term Debt (in Dollars)	750,000