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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2015 | May 03, 2014
Intangible Assets [Line Items] |  |
Gross | $ 42.4 mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsExcludingGoodwillGross | $ 42.5 mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsExcludingGoodwillGross
Accumulated Amortization | 30.7 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 29.5 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net | 11.7 us-gaap_IntangibleAssetsNetExcludingGoodwill | 13.0 us-gaap_IntangibleAssetsNetExcludingGoodwill
Indefinite-lived trade names | 1.8 us-gaap_IndefiniteLivedTradeNames | 1.8 us-gaap_IndefiniteLivedTradeNames
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |
2015 | 1.5 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear |
2016 | 1.2 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |
2017 | 1.1 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |
2018 | 1.1 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |
2019 | 1.0 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |
Customer relationships and agreements |  |
Intangible Assets [Line Items] |  |
Gross | 16.5 us-gaap_FiniteLivedIntangibleAssetsGross / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 16.6 us-gaap_FiniteLivedIntangibleAssetsGross / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated Amortization | 15.1 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 14.7 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Net | 1.4 us-gaap_FiniteLivedIntangibleAssetsNet / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 1.9 us-gaap_FiniteLivedIntangibleAssetsNet / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Finite-Lived Intangible Assets, Weighted Average Remaining Amortization Period | 9 years 1 month 3 days | 9 years 10 months 18 days
Trade names, patents and technology licences |  |
Intangible Assets [Line Items] |  |
Gross | 25.8 mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsExcludingGoodwillGross / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = mei_TradeNamesPatentsAndTechnologyLicencesMember | 25.8 mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsExcludingGoodwillGross / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = mei_TradeNamesPatentsAndTechnologyLicencesMember
Accumulated Amortization | 15.6 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = mei_TradeNamesPatentsAndTechnologyLicencesMember | 14.8 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = mei_TradeNamesPatentsAndTechnologyLicencesMember
Finite-Lived Intangible Assets, Weighted Average Remaining Amortization Period | 9 years 3 months 3 days | 9 years 9 months 18 days
Net | 10.2 us-gaap_IntangibleAssetsNetExcludingGoodwill / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = mei_TradeNamesPatentsAndTechnologyLicencesMember | 11.0 us-gaap_IntangibleAssetsNetExcludingGoodwill / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = mei_TradeNamesPatentsAndTechnologyLicencesMember
Covenants not to compete |  |
Intangible Assets [Line Items] |  |
Gross | 0.1 us-gaap_FiniteLivedIntangibleAssetsGross / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 0.1 us-gaap_FiniteLivedIntangibleAssetsGross / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Accumulated Amortization | 0 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 0 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Net | $ 0.1 us-gaap_FiniteLivedIntangibleAssetsNet / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | $ 0.1 us-gaap_FiniteLivedIntangibleAssetsNet / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Finite-Lived Intangible Assets, Weighted Average Remaining Amortization Period | 2 years 8 months 0 days | 3 years 5 months 0 days

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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