Gains and Losses on the Sale of Property, Plant and Equipment (detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 27, 2015	Sep. 26, 2015	Sep. 27, 2014
Property Plant And Equipment [Abstract]
Gain (Loss) on Disposition of Assets		$ 143,000	$ 56,000
Environmental Remediation Expense	$ 60,000		$ 250,000
Restructuring Cost and Reserve [Line Items]
Prop 65 Litigation	$ 200,000