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SEGMENT INFORMATION (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2015 | Feb. 01, 2014 | Jan. 31, 2015 segment | Feb. 01, 2014
Segment Reporting [Abstract] |  |  |  |
Number of reportable segments |  |  | 4 us-gaap_NumberOfReportableSegments |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | $ (189.8)us-gaap_Revenues |  |
Net sales to unaffiliated customers | 206.0 us-gaap_SalesRevenueNet | 189.8 us-gaap_SalesRevenueNet | 653.8 us-gaap_SalesRevenueNet | 547.9 us-gaap_SalesRevenueNet
Income (loss) from operations | 34.7 us-gaap_OperatingIncomeLoss | 16.4 us-gaap_OperatingIncomeLoss | 97.7 us-gaap_OperatingIncomeLoss | 53.3 us-gaap_OperatingIncomeLoss
Interest (income)/expense, net | (0.2)mei_InterestExpenseIncomeNet | 0.1 mei_InterestExpenseIncomeNet | (0.4)mei_InterestExpenseIncomeNet | 0.3 mei_InterestExpenseIncomeNet
Other expense, net | (0.3)us-gaap_OtherNonoperatingIncomeExpense | 0.3 us-gaap_OtherNonoperatingIncomeExpense | (0.2)us-gaap_OtherNonoperatingIncomeExpense | 0.8 us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes | 35.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 16.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 98.3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 52.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (206.0)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |  | (653.8)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | (547.9)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Automotive |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales to unaffiliated customers | 141.1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember | 128.7 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember | 463.4 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember | 358.7 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember
Income (loss) from operations | 29.5 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember | 17.4 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember | 92.8 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember | 46.8 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember
Automotive | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (142.6)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember | (129.4)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember | (466.5)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember | (360.3)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember
Automotive | Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (1.5)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember | (0.7)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember | (3.1)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember | (1.6)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_AutomotiveMember
Interconnect |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales to unaffiliated customers | 36.9 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember | 41.5 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember | 121.4 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember | 130.1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember
Income (loss) from operations | 3.8 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember | 6.0 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember | 15.7 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember | 21.4 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember
Interconnect | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (37.4)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember | (42.3)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember | (123.1)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember | (132.2)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember
Interconnect | Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (0.5)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember | (0.8)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember | (1.7)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember | (2.1)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_InterconnectMember
Power Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales to unaffiliated customers | 26.1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember | 18.0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember | 63.9 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember | 53.8 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember
Income (loss) from operations | 9.3 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember | 2.7 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember | 17.9 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember | 9.6 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember
Power Products | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (26.3)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember | (18.0)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember | (64.3)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember | (53.9)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember
Power Products | Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (0.2)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember | (0.4)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember | (0.1)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_PowerProductsMember
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales to unaffiliated customers | 1.8 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 1.7 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 5.1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 5.0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Income (loss) from operations | (1.2)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (1.6)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (4.1)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (2.9)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (1.9)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (1.8)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (5.3)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (5.1)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (0.1)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (0.1)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (0.2)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (0.1)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Eliminations/Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 2.2 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember | 1.7 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember | 5.4 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember | 3.6 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember
Net sales to unaffiliated customers | 0.1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember | (0.1)us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember | 0 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember | 0.3 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember
Income (loss) from operations | (6.7)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember | (8.1)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember | (24.6)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember | (21.6)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember
Eliminations/Corporate | Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 2.3 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember | $ 1.6 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember | $ 5.4 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember | $ 3.9 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_StatementBusinessSegmentsAxis = mei_CorporateAndIntersegmentEliminationMember

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