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Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 01, 2016
May 03, 2015
Apr. 27, 2014
Goodwill and Intangible Assets Disclosure [Abstract]      
beginning balance $ 11,462 $ 11,462 $ 11,462
loss on impairment 0 0 0
acquisitions 0 0 0
ending balance $ 11,462 $ 11,462 $ 11,462