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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 29, 2017
Apr. 30, 2016
Apr. 25, 2015
Property, Plant and Equipment      
Gross property, plant and equipment $ 490,857 $ 482,990  
Accumulated depreciation (321,725) (311,400)  
Net property, plant and equipment 169,132 171,590  
Depreciation expense 25,400 23,300 $ 19,300
Buildings and building fixtures      
Property, Plant and Equipment      
Gross property, plant and equipment $ 196,817 192,211  
Buildings and building fixtures | Minimum      
Property, Plant and Equipment      
Estimated Useful Lives 3 years    
Buildings and building fixtures | Maximum      
Property, Plant and Equipment      
Estimated Useful Lives 40 years    
Machinery and equipment      
Property, Plant and Equipment      
Gross property, plant and equipment $ 141,071 143,561  
Machinery and equipment | Minimum      
Property, Plant and Equipment      
Estimated Useful Lives 3 years    
Machinery and equipment | Maximum      
Property, Plant and Equipment      
Estimated Useful Lives 15 years    
Information systems and software      
Property, Plant and Equipment      
Gross property, plant and equipment $ 76,684 72,275  
Information systems and software | Minimum      
Property, Plant and Equipment      
Estimated Useful Lives 3 years    
Information systems and software | Maximum      
Property, Plant and Equipment      
Estimated Useful Lives 10 years    
Land      
Property, Plant and Equipment      
Gross property, plant and equipment $ 14,565 14,346  
Land improvements      
Property, Plant and Equipment      
Gross property, plant and equipment $ 15,178 15,007  
Land improvements | Minimum      
Property, Plant and Equipment      
Estimated Useful Lives 3 years    
Land improvements | Maximum      
Property, Plant and Equipment      
Estimated Useful Lives 30 years    
Transportation equipment      
Property, Plant and Equipment      
Gross property, plant and equipment $ 14,905 15,728  
Transportation equipment | Minimum      
Property, Plant and Equipment      
Estimated Useful Lives 3 years    
Transportation equipment | Maximum      
Property, Plant and Equipment      
Estimated Useful Lives 10 years    
Furniture and fixtures      
Property, Plant and Equipment      
Gross property, plant and equipment $ 20,390 19,397  
Furniture and fixtures | Minimum      
Property, Plant and Equipment      
Estimated Useful Lives 3 years    
Furniture and fixtures | Maximum      
Property, Plant and Equipment      
Estimated Useful Lives 15 years    
Construction in progress      
Property, Plant and Equipment      
Gross property, plant and equipment $ 11,247 $ 10,465