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Selected Financial Statement Data - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Apr. 29, 2023
Apr. 30, 2022
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 265,488 $ 252,285
Less accumulated depreciation 193,341 185,520
Property, Plant and Equipment, Net 72,147 66,765
Land    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,996 1,899
Buildings    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 71,222 69,170
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 126,164 110,079
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 4,112 4,098
Computer software and hardware    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 44,700 46,922
Construction in Process    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 2,805 5,792
Demonstration equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 7,432 7,260
Transportation equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 7,057 $ 7,065