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Net Income Per Share - Narrative (Detail)
3 Months Ended 9 Months Ended
Jan. 26, 2014
Jan. 27, 2013
Jan. 26, 2014
Jan. 27, 2013
Earnings Per Share Disclosure [Line Items]        
Number of shares of common stock excluded from the computation of basic net income 61,667 123,335 61,667 123,335
Stock Options [Member]
       
Earnings Per Share Disclosure [Line Items]        
Number of common stock options excluded from the computation of diluted net income per share       2,000