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Consolidated Statements of Operations (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2011
Pre-tax gain on sale of a subsidiary	$ 4,148
Income taxes related to the sale	$ 3,493

X

- Definition

Divestiture of Interest in Consolidated Subsidiaries, Gain (Loss) from Divestiture before Income Tax

+ References

No definition available.

+ Details

Name:	mei_DivestitureOfInterestInConsolidatedSubsidiariesGainLossFromDivestitureBeforeIncomeTax
Namespace Prefix:	mei_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Divestiture of Interest in Consolidated Subsidiaries, Income Tax

+ References

No definition available.

+ Details

Name:	mei_DivestitureOfInterestInConsolidatedSubsidiariesIncomeTax
Namespace Prefix:	mei_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration