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Stock-Based Compensation - Time Vested Restricted Stock Activity (Detail) - Time Vested Restricted Stock Awards [Member] - shares
12 Months Ended
May. 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
outstanding at beginning of year 61,668 123,335 185,000
granted 0 0 0
vested (61,668) (61,667) (61,665)
outstanding at end of year 0 61,668 123,335