Restructuring (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended	18 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014	Dec. 27, 2014	Jun. 27, 2015
Restructuring Reserve [Roll Forward]
Beginning Balance			$ 997,000
Charges	$ 0	$ 0	58,000	$ 0	$ 2,300,000
Cash Payments			(631,000)
Ending Balance	424,000	$ 0	424,000	$ 0	997,000	$ 424,000
Employee severance and benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			383,000
Charges			45,000			1,100,000
Cash Payments			(428,000)
Ending Balance	0		0		383,000	0
Facility termination costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			583,000
Charges			0			900,000
Cash Payments			(168,000)
Ending Balance	415,000		415,000		583,000	415,000
Other [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			31,000
Charges			13,000			400,000
Cash Payments			(35,000)
Ending Balance	$ 9,000		$ 9,000		$ 31,000	$ 9,000