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Shareholders' Equity - Additional Information (Detail) (USD $)	6 Months Ended
	Oct. 27, 2012	Apr. 28, 2012	Oct. 29, 2011
Class of Stock [Line Items]
Dividend declared date	Nov. 17, 2009
Dividend payable, record date	Nov. 27, 2009
Common stock, par value	$ 0.001	$ 0.001	$ 0.001
Proportion of preferred stock in common stock	1/1000th
Preferred stock price per share	$ 100.00
Rights expiry date	November 17, 2012
Series I Preferred Stock
Class of Stock [Line Items]
Preferred stock, par value per share	$ 0.001

Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share.

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- Definition

The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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