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Balance Sheet Components - Pre-production Tooling Costs Related to Long-term Supply Arrangements - Narrative (Details) - USD ($) $ in Millions	Oct. 31, 2020	May 02, 2020
Preproduction Tooling Costs Relatedto Longterm Supply Arrangements [Abstract]
Pre-production Costs	$ 32.5	$ 37.1
Preproduction costs related to long-term supply arrangements, asset for molds dies and tools owned	$ 15.8	$ 19.0

X

- Definition

Pre-production Tooling Costs Related to Long-term Supply Arrangements [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	mei_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount as of the balance sheet date of capitalized costs of molds, dies, and other tools that the entity does not own which are or will be used in producing goods under a long-term supply arrangement, and for which there is a noncancelable right of use during such arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 10
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6387057&loc=d3e6233-108318

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=27011391&loc=d3e105117-122735

+ Details

Name:	us-gaap_PreproductionCostsRelatedToLongTermSupplyArrangementsAssetForMoldsDiesAndToolsNotOwned
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amount as of the balance sheet date of capitalized costs of molds, dies, and other tools that will be used in producing products under a long-term supply arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=27011391&loc=d3e105117-122735

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 10
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6387057&loc=d3e6169-108318

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant