Consolidated Balance Sheets (Parenthetical) (USD $)	Jan. 31, 2015	May 03, 2014	Jan. 25, 2014
Series J Preferred Stock, par value	$ 0.001	$ 0.001	$ 0.001
Series J Preferred Stock, shares authorized	5,000,000us-gaap_TemporaryEquitySharesAuthorized	5,000,000us-gaap_TemporaryEquitySharesAuthorized	5,000,000us-gaap_TemporaryEquitySharesAuthorized
Series J Preferred Stock, shares issued	204,000us-gaap_TemporaryEquitySharesIssued	204,000us-gaap_TemporaryEquitySharesIssued	204,000us-gaap_TemporaryEquitySharesIssued
Common stock, par value	$ 0.001	$ 0.001	$ 0.001
Common stock, shares authorized	300,000,000us-gaap_CommonStockSharesAuthorized	300,000,000us-gaap_CommonStockSharesAuthorized	300,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	97,485,000us-gaap_CommonStockSharesIssued	93,540,000us-gaap_CommonStockSharesIssued	93,335,000us-gaap_CommonStockSharesIssued
Treasury stock, shares	34,580,000us-gaap_TreasuryStockShares	34,364,000us-gaap_TreasuryStockShares	34,295,000us-gaap_TreasuryStockShares

The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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