XML 44 R32.htm IDEA: XBRL DOCUMENT
v3.5.0.1

Significant Accounting Policies - Narrative - Financial Reporting Periods (Details) | 12 Months Ended
--- | ---
Apr. 30, 2016 | May 02, 2015 | May 03, 2014
Financial Reporting Periods [Line Items] |  |  |
Fiscal year duration | fifty-two weeks | fifty-two weeks | 53
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
- Definition [Line Items] for Financial Reporting Periods [Table] + References No definition available. + 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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |