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INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2015 | May 03, 2014 | Feb. 01, 2014 | Jan. 31, 2015 | Feb. 01, 2014
Valuation Allowance [Line Items] |  |  |  |  |
Deferred Federal and State income tax expense (benefit) |  | $ 31.7 mei_DeferredFederalAndStateIncomeTaxExpenseBenefit |  |  |
Federal tax expense (benefit) |  |  |  | (8.1)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations |
State tax expense (benefit) |  |  |  | (2.7)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations |
Research tax credit carryforwards | 0.7 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch |  |  | 0.7 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch |
Income tax expense | 8.1 us-gaap_IncomeTaxExpenseBenefit |  | 1.4 us-gaap_IncomeTaxExpenseBenefit | 23.8 us-gaap_IncomeTaxExpenseBenefit | 4.2 us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate | 23.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations |  | 8.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 24.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 8.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Unrecognized tax benefits, income tax penalties and interest accrued | 0.1 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |  | 0.1 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |
Total unrecognized tax benefit | 0.8 us-gaap_UnrecognizedTaxBenefits |  |  | 0.8 us-gaap_UnrecognizedTaxBenefits |
Change in unrecognized tax benefits |  |  |  | 0 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease |
Malta | Investment Tax Credit Carryforward |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Investment tax credit on qualified expenditures, percent | 30.00%mei_InvestmentTaxCreditForeignPercentageOfQualifiedExpenditures / us-gaap_StatementGeographicalAxis = country_MT / us-gaap_TaxCreditCarryforwardAxis = us-gaap_InvestmentCreditMember |  |  | 30.00%mei_InvestmentTaxCreditForeignPercentageOfQualifiedExpenditures / us-gaap_StatementGeographicalAxis = country_MT / us-gaap_TaxCreditCarryforwardAxis = us-gaap_InvestmentCreditMember |
Unused credits | 18.7 us-gaap_TaxCreditCarryforwardAmount / us-gaap_StatementGeographicalAxis = country_MT / us-gaap_TaxCreditCarryforwardAxis = us-gaap_InvestmentCreditMember |  |  | 18.7 us-gaap_TaxCreditCarryforwardAmount / us-gaap_StatementGeographicalAxis = country_MT / us-gaap_TaxCreditCarryforwardAxis = us-gaap_InvestmentCreditMember |
Valuation allowance | 7.6 us-gaap_TaxCreditCarryforwardValuationAllowance / us-gaap_StatementGeographicalAxis = country_MT / us-gaap_TaxCreditCarryforwardAxis = us-gaap_InvestmentCreditMember |  |  | 7.6 us-gaap_TaxCreditCarryforwardValuationAllowance / us-gaap_StatementGeographicalAxis = country_MT / us-gaap_TaxCreditCarryforwardAxis = us-gaap_InvestmentCreditMember |
Federal |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Operating loss carryforwards | 25.0 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  | 25.0 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |
State |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Operating loss carryforwards | 93.0 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  | 93.0 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Foreign |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Operating loss carryforwards | 11.1 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  | 11.1 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
Domestic federal and state |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Valuation allowances against deferred tax assets | $ 2.6 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_DomesticCountryMember | $ 2.6 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_DomesticCountryMember |  | $ 2.6 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_DomesticCountryMember |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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