Income Taxes (Details) (USD $)	3 Months Ended	6 Months Ended
Oct. 30, 2011	Oct. 31, 2010	Oct. 30, 2011	Oct. 31, 2010	Apr. 30, 2011
Provision for income taxes	$ 1,369,000	$ 567,000	$ 1,917,000	$ 2,649,000
Income Tax Uncertainties [Abstract]
Unrecognized tax benefits	13,900,000,000		13,900,000,000		13,900,000
Unrecognized tax benefits that would impact effective tax rate	11,700,000,000		11,700,000,000		11,700,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 0		$ 0

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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