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Selected Financial Statement Data Property and Equipment (Details) - USD ($)
$ in Thousands
Jan. 26, 2019
Apr. 28, 2018
Property, Plant and Equipment [Line Items]    
Land $ 1,738 $ 2,161
Buildings 66,170 67,773
Machinery and equipment 98,409 93,439
Office furniture and equipment 6,079 5,878
Computer software and hardware 55,000 53,004
Equipment held for rental 287 287
Demonstration equipment 7,331 7,035
Transportation equipment 7,724 7,632
Property, Plant and Equipment, Gross 242,738 237,209
Less accumulated depreciation 176,973 169,150
Property and equipment, net $ 65,765 $ 68,059