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Stock-Based Compensation - Stock Option Activity (Detail) - $ / shares
12 Months Ended
May. 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Shares      
outstanding at beginning of year 153,950 182,825 209,475
granted     2,000
exercised (10,100) (23,125) (23,025)
canceled/expired (3,750) (5,750) (5,625)
outstanding at end of year 140,100 153,950 182,825
Weighted-Average Exercise Price      
outstanding at beginning of year $ 6.70 $ 6.99 $ 7.22
granted     12.13
exercised 9.31 8.40 8.92
canceled/expired 7.27 9.28 9.37
outstanding at end of year $ 6.49 $ 6.70 $ 6.99