Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 29, 2018	Mar. 31, 2018
Property, plant and equipment
Property, plant and equipment, at cost	$ 90,902	$ 87,768
Accumulated depreciation	(25,794)	(24,413)
Property, plant and equipment, net	65,108	63,355
Land [Member]
Property, plant and equipment
Property, plant and equipment, at cost	24,131	24,001
Buildings and improvements [Member]
Property, plant and equipment
Property, plant and equipment, at cost	41,058	39,613
Machinery and equipment [Member]
Property, plant and equipment
Property, plant and equipment, at cost	$ 25,713	$ 24,154