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Contingencies - Narrative (Details) $ in Millions | Mar. 02, 2020 USD ($)
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Compensatory Damages |
Loss Contingencies [Line Items] |
Gain Contingency, Unrecorded Amount | $ 102
Punitive Damages |
Loss Contingencies [Line Items] |
Gain Contingency, Unrecorded Amount | $ 11

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- Definition The amount or range of possible amounts of gain that could be realized upon the resolution of a contingency. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6397426&loc=d3e17499-108355 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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
Name: | us-gaap_GainContingenciesByNatureAxis=mei_PunitiveDamagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |