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Intangible Assets and Goodwill - Narrative - Indefinite-lived Intangibles Excluding Goodwill, Impairment Test (Details)	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Indefinite-lived Intangible Assets [Line Items]
Percentage by which fair value exceeded carrying value	44.00%	28.00%	17.00%

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- Definition

Intangible Assets, Indefinite-lived (Excluding Goodwill), Impairment Test, Excess of Fair Value over Carrying Value, Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	mei_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration