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Description of Business and Summary of Significant Accounting Policies - Financial Reporting Periods (Details)	12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Financial Reporting Periods [Line Items]
Fiscal year duration	52	52	52
Minimum
Financial Reporting Periods [Line Items]
Fiscal year duration	52
Maximum
Financial Reporting Periods [Line Items]
Fiscal year duration	53

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- Definition

[Line Items] for Financial Reporting Periods [Table]

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No definition available.

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- Definition

Fiscal Year Duration

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No definition available.

+ Details

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Namespace Prefix:	mei_
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Balance Type:	na
Period Type:	duration

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- Details

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Period Type:

X

- Details

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