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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Mar. 31, 2018
Property, plant and equipment    
Property, plant and equipment, at cost $ 93,171 $ 87,768
Accumulated depreciation (26,793) (24,413)
Property, plant and equipment, net 66,378 63,355
Land [Member]    
Property, plant and equipment    
Property, plant and equipment, at cost 24,370 24,001
Buildings and improvements [Member]    
Property, plant and equipment    
Property, plant and equipment, at cost 42,630 39,613
Machinery and equipment [Member]    
Property, plant and equipment    
Property, plant and equipment, at cost $ 26,171 $ 24,154