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Cash Flow Information - Non-Cash Investing and Financing Activities (Details) - USD ($)
$ in Thousands
12 Months Ended
May. 02, 2015
Apr. 26, 2014
Apr. 27, 2013
Supplemental Cash Flow Elements [Abstract]      
Demonstration equipment transferred to inventory $ 34 $ 255 $ 612
Purchases of property and equipment included in accounts payable 1,510 2,099 1,207
Contributions of common stock under the employee stock purchase plan $ 2,512 $ 1,552 $ 1,482