XML 101 R85.htm IDEA: XBRL DOCUMENT v3.5.0.1
Cash Flow Information - Non-Cash Investing and Financing Activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2016
May 02, 2015
Apr. 26, 2014
Supplemental Cash Flow Elements [Abstract]      
Demonstration equipment transferred to inventory $ 227 $ 34 $ 255
Purchases of property and equipment included in accounts payable 142 1,510 2,099
Contributions of common stock under the employee stock purchase plan 1,777 2,512 1,552
Deferred Purchase Price $ 1,955 $ 0 $ 0