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Selected Financial Statement Data - Inventory (Details) - USD ($)
$ in Thousands
May. 02, 2015
Apr. 26, 2014
Selected Financial Statement Data [Abstract]    
Raw materials $ 28,325 $ 27,660
Work-in-process 7,512 11,835
Finished goods 28,552 22,733
Inventories 64,389 62,228
Inventory allowance $ 3,998 $ 2,692