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Summary of Cash and Cash Equivalents by Geographic Area (Detail) - USD ($)
$ in Thousands
May. 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Apr. 29, 2012
Cash and Cash Equivalents [Line Items]        
cash and cash equivalents $ 29,725 $ 29,303 $ 23,530 $ 25,023
China [Member]        
Cash and Cash Equivalents [Line Items]        
cash and cash equivalents 13,018 15,258    
Cayman Islands [Member]        
Cash and Cash Equivalents [Line Items]        
cash and cash equivalents 8,591      
Canada [Member]        
Cash and Cash Equivalents [Line Items]        
cash and cash equivalents 5,178 9,139    
United States [Member]        
Cash and Cash Equivalents [Line Items]        
cash and cash equivalents 2,918 4,725    
Poland [Member]        
Cash and Cash Equivalents [Line Items]        
cash and cash equivalents $ 20 $ 181