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Segment Reporting - Net Sales and Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
 12 Months Ended
May. 02, 2015
Apr. 26, 2014
Apr. 27, 2013
Net sales:      
Net sales $ 615,942 $ 551,970 $ 518,322
Long-lived assets:      
Long-lived assets 72,844 65,270 61,625
United States      
Net sales:      
Net sales 494,860 453,468 430,242
Long-lived assets:      
Long-lived assets 67,882 60,846 60,060
Outside U.S.      
Net sales:      
Net sales 121,082 98,502 88,080
Long-lived assets:      
Long-lived assets $ 4,962 $ 4,424 $ 1,565