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Income Taxes - Net Operating Loss Carryforwards (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 27, 2013
Federal
Operating Loss Carryforwards [Line Items]
Tax benefits subject to expiration	$ 7,782
Expiration period	20 years
State
Operating Loss Carryforwards [Line Items]
Tax benefits subject to expiration	$ 4,020
State | Minimum
Operating Loss Carryforwards [Line Items]
Expiration period	12 years
State | Maximum
Operating Loss Carryforwards [Line Items]
Expiration period	20 years

X

- Definition

Operating Loss Carryforwards Expiration Period

+ References

No definition available.

+ Details

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

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates.

+ References

No definition available.

+ Details

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

X

- Details

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