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Significant Accounting Policies - Narrative - Financial Reporting Periods (Details)	12 Months Ended
	May. 02, 2015	May. 03, 2014	Apr. 27, 2013
Financial Reporting Periods [Line Items]
Fiscal year duration
Minimum
Financial Reporting Periods [Line Items]
Fiscal year duration
Maximum
Financial Reporting Periods [Line Items]
Fiscal year duration

X

- Definition

[Line Items] for Financial Reporting Periods [Table]

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Fiscal Year Duration

+ References

No definition available.

+ Details

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Namespace Prefix:	mei_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: