2.4.0.84050 - Disclosure - Stock-based Compensation (Details)truefalsefalse1false USDfalsefalse$D2014Q1_StockOptionsMemberhttp://www.sec.gov/CIK0000724004duration2013-04-01T00:00:002013-06-30T00:00:00SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$D2013Q1_StockOptionsMemberhttp://www.sec.gov/CIK0000724004duration2012-04-01T00:00:002012-06-30T00:00:00PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalseD2013_StockOptionsMemberhttp://www.sec.gov/CIK0000724004duration2012-04-01T00:00:002013-03-31T00:00:00SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$1true 4us-gaap_ShareBasedCompensationAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Amounts recognized in the condensed financial statements related to stock-based compensation2false 5us-gaap_AllocatedShareBasedCompensationExpenseus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse149000149000USD$falsetruefalse2truefalsefalse149000149000USD$falsetruefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false3Exercisable at the end of the period (in dollars per share)28true 4mlab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageContractualTermAbstractmlab_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Weighted- average Remaining Contractual Term29false 5us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2us-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse004 years 3 months 18 daysfalsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse003 years 8 months 12 daysfalsefalsefalsexbrli:durationItemTypenaWeighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false0Outstanding30false 5mlab_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsInPeriodWeightedAverageRemainingContractualTermmlab_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse006 years 2 months 12 daysfalsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:durationItemTypenaWeighted average remaining contractual term for option awards granted during the reporting period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.No definition available.false0Stock options granted31false 5us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1us-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse003 years 2 months 12 daysfalsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:durationItemTypenaWeighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false0Exercisable at the end of the period32true 4mlab_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateIntrinsicValueAbstractmlab_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Aggregate Intrinsic Value33false 5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValueus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse98930009893000USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse95290009529000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Outstanding at the end of the period34false 5us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1us-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse70860007086000USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAmount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false2Exercisable at the end of the period35false 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValueus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse329000329000USD$falsefalsefalse2truefalsefalse851000851000USD$falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -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. false2Intrinsic value of stock options exercised36true 4mlab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedOutstandingRollForwardmlab_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Unvested Shares37false 5mlab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedOutstandingNumbermlab_falsenainstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse257805257805falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:sharesItemTypesharesThe number of shares reserved for the issuance under the option agreements awarded under the plan that are unvested and outstanding as of the balance sheet date.No 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5mlab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedOutstandingNumbermlab_falsenainstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse262145262145falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse257805257805falsefalsefalsexbrli:sharesItemTypesharesThe number of shares reserved for the issuance under the option agreements awarded under the plan that are unvested and outstanding as of the balance sheet date.No definition available.false1Unvested at the end of the period (in shares)42true 4mlab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueRollForwardmlab_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Weighted-average Grant-Date Fair Value43false 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applying the disclosed option pricing methodology.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 false3Stock options granted (in dollars per share)45false 5mlab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedForfeituresInPeriodWeightedAverageGrantDateFairValuemlab_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse9.919.91USD$falsetruefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsenum:perShareItemTypedecimalThe weighted average grant-date fair value of unvested options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.No definition available.false3Stock options forfeited (in dollars per share)46false 5mlab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValuemlab_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse6.926.92USD$falsetruefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsenum:perShareItemTypedecimalRepresents the weighted average grant-date fair value of nonvested options vested during the reporting period as calculated by applying the disclosed option pricing methodology.No definition available.false3Stock options vested (in dollars per share)47false 5mlab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedWeightedAverageGrantDateFairValuemlab_falsenainstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse11.4411.44USD$falsetruefalse2falsefalsefalse00falsefalsefalse3truefalsefalse9.559.55USD$falsetruefalsenum:perShareItemTypedecimalThe weighted average grant date fair value of nonvested options that are outstanding as of the balance-sheet date, under stock option plans.No definition available.false3Unvested at the end of the period (in dollars per share)48true 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Other stock option disclosures49false 5us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptionsus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse27470002747000USD$falsetruefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAggregate unrecognized cost of option awards made to employees under a stock option plan or plans, that have yet to vest.No definition available.false2Unrecognized compensation cost50false 5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse216265216265falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:sharesItemTypesharesThe difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; 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