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Selected Financial Statement Data - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Apr. 30, 2022
May 01, 2021
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 252,285 $ 233,387
Less accumulated depreciation 185,520 174,705
Property, Plant and Equipment, Net 66,765 58,682
Land    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,899 1,924
Buildings    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 69,170 69,608
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 110,079 98,451
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 4,098 4,103
Computer software and hardware    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 46,922 44,851
Construction in Process    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 5,792 0
Demonstration equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 7,260 7,186
Transportation equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 7,065 $ 7,264