Restructuring (table) (detail) (USD $)	3 Months Ended			9 Months Ended
	Dec. 27, 2014	Sep. 28, 2013	Jun. 29, 2013	Dec. 27, 2014	Dec. 28, 2013	Mar. 31, 2014	Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]
Balance			$ 1,501,000	$ 10,000	$ 1,501,000
Plant Restructuring	889,000	347,000	154,000	889,000	501,000
Cash payments/write offs				(8,000)	(408,000)
Balance	891,000			891,000	1,594,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Balance			20,000	10,000	20,000
Plant Restructuring	533,000
Cash payments/write offs				(8,000)	(8,000)
Balance	535,000			535,000	12,000
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Balance			307,000		307,000	0
Plant Restructuring	40,000	6,000	154,000
Cash payments/write offs					(400,000)
Balance	40,000			40,000	67,000	0
Long Lived Asset Charges [Member]
Restructuring Cost and Reserve [Line Items]
Balance						0	1,174,000
Plant Restructuring	316,000	341,000
Balance	$ 316,000			$ 316,000	$ 1,515,000	$ 0	$ 1,174,000