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Significant Accounting Policies - Financial Reporting Periods (Details)	12 Months Ended
	Apr. 27, 2013	Apr. 28, 2012	Apr. 30, 2011
Financial Reporting Periods [Line Items]
Fiscal year duration	fifty-two weeks	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