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Selected Financial Statement Data - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Apr. 27, 2024
Apr. 29, 2023
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 276,273 $ 265,488
Less accumulated depreciation 204,521 193,341
Property, plant and equipment, net 71,752 72,147
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,895 1,996
Buildings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 71,670 71,222
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 131,983 126,164
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,765 4,112
Computer software and hardware    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 46,135 44,700
Construction in Process    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 5,064 2,805
Demonstration equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 7,094 7,432
Transportation equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 7,667 $ 7,057