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Cash Flow Information - Non-Cash Investing and Financing Activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 29, 2017
Apr. 30, 2016
May 02, 2015
Supplemental Cash Flow Elements [Abstract]      
Demonstration equipment transferred to inventory $ 218 $ 227 $ 34
Purchases of property and equipment included in accounts payable 2,524 142 1,510
Contributions of common stock under the employee stock purchase plan 840 1,777 2,512
Contingent consideration related to acquisition of ADFLOW $ 31 $ 1,955 $ 0