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Benefit Plans (Detail) - USD ($)
12 Months Ended
May. 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Contributions to defined contribution plans $ 798,000 $ 696,000 $ 635,000
Contributions to nonqualified deferred compensation plan 174,000 166,000 $ 145,000
Investment assets of Trust at fair value 2,415,000 765,000  
Deferred Compensation [Member]      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Nonqualified deferred compensation plan liability $ 4,000,000 $ 2,600,000