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Revenue (Details)	12 Months Ended
	Apr. 30, 2022
Minimum
Accounts Receivable and Allowance for Doubtful Accounts [Line Items]
Accounts receivable collection terms	30 days
Maximum
Accounts Receivable and Allowance for Doubtful Accounts [Line Items]
Accounts receivable collection terms	45 days

X

- Definition

Accounts receivable collection terms.

+ References

No definition available.

+ Details

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

X

- Definition

Accounts receivable and allowance for doubtful accounts.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: