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Net Income Per Share - Narrative (Detail)	12 Months Ended
Net Income Per Share - Narrative (Detail)	Apr. 28, 2013	Apr. 29, 2012	May 01, 2011
Earnings Per Share Disclosure [Line Items]
Number of shares of common stock excluded from the computation of basic net income	123,335	185,000	195,000
Stock Options [Member]
Earnings Per Share Disclosure [Line Items]
Number of common stock options excluded from the computation of diluted net loss per share		24,750

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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