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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	$ 42.4mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsExcludingGoodwillGross	$ 42.5mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsExcludingGoodwillGross
Accumulated Amortization	30.7us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	29.5us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net	11.7us-gaap_IntangibleAssetsNetExcludingGoodwill	13.0us-gaap_IntangibleAssetsNetExcludingGoodwill
Indefinite-lived trade names	1.8us-gaap_IndefiniteLivedTradeNames	1.8us-gaap_IndefiniteLivedTradeNames
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2015	1.5us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016	1.2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2017	1.1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2018	1.1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2019	1.0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Customer relationships and agreements
Intangible Assets [Line Items]
Gross	16.5us-gaap_FiniteLivedIntangibleAssetsGross / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	16.6us-gaap_FiniteLivedIntangibleAssetsGross / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated Amortization	15.1us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	14.7us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Net	1.4us-gaap_FiniteLivedIntangibleAssetsNet / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	1.9us-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	25.8mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsExcludingGoodwillGross / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = mei_TradeNamesPatentsAndTechnologyLicencesMember	25.8mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsExcludingGoodwillGross / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = mei_TradeNamesPatentsAndTechnologyLicencesMember
Accumulated Amortization	15.6us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = mei_TradeNamesPatentsAndTechnologyLicencesMember	14.8us-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	10.2us-gaap_IntangibleAssetsNetExcludingGoodwill / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = mei_TradeNamesPatentsAndTechnologyLicencesMember	11.0us-gaap_IntangibleAssetsNetExcludingGoodwill / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = mei_TradeNamesPatentsAndTechnologyLicencesMember
Covenants not to compete
Intangible Assets [Line Items]
Gross	0.1us-gaap_FiniteLivedIntangibleAssetsGross / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	0.1us-gaap_FiniteLivedIntangibleAssetsGross / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Accumulated Amortization	0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Net	$ 0.1us-gaap_FiniteLivedIntangibleAssetsNet / mei_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	$ 0.1us-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

Finite-lived and Indefinite-lived Intangible Assets, Excluding Goodwill, Gross

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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