Gains and Losses on the Sale of Property, Plant and Equipment (detail) - USD ($)	3 Months Ended
	Jul. 01, 2017	Jul. 02, 2016
Property Plant And Equipment [Abstract]
Gain (Loss) on Disposition of Assets	$ 1,598,000	$ (6,000)
Gain Loss On Purchase Of Business During Period	(1,096,000)
Midwest Plant [Member]
Restructuring Cost and Reserve [Line Items]
Gain From Plant Closing	$ 1,081,000