Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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+ Details

General - Additional Information (Detail) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 26, 2013	Jan. 28, 2012	Jan. 26, 2013	Jan. 28, 2012
Stock Options
Summary Of Significant Accounting Policies [Line Items]
Securities excluded from calculation of diluted earnings per share	420	549	421	563
Unvested restricted stock awards
Summary Of Significant Accounting Policies [Line Items]
Securities excluded from calculation of diluted earnings per share		80		186