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Significant Accounting Policies - Narrative - Financial Reporting Periods (Details) | 12 Months Ended
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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 |  |  |

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- Definition [Line Items] for Financial Reporting Periods [Table] + References No definition available. + Details
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- 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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |