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Net Income Per Share - Narrative (Detail)
3 Months Ended
Jul. 28, 2013
Aug. 03, 2014
Time Vested Restricted Stock Awards [Member]
Earnings Per Share Disclosure [Line Items]    
Number of shares of common stock excluded from the computation of basic net income 61,667  
Number of shares outstanding and unvested of common stock not affecting computation of basic net income per share   0