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Significant Accounting Policies - Financial Reporting Periods (Details) | 12 Months Ended
--- | ---
May 03, 2014 | Apr. 27, 2013 | Apr. 28, 2012
Financial Reporting Periods [Line Items] |  |  |
Fiscal year duration | 53 | fifty-two weeks | fifty-two weeks
Minimum |  |  |
Financial Reporting Periods [Line Items] |  |  |
Fiscal year duration |  | fifty-two weeks |
Maximum |  |  |
Financial Reporting Periods [Line Items] |  |  |
Fiscal year duration |  | fifty-three weeks |

X
- Details
Name: | mei_FinancialReportingPeriodsLineItems
Namespace Prefix: | mei_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fiscal Year Duration + References No definition available. + Details
Name: | mei_FiscalYearDuration
Namespace Prefix: | mei_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration