Restructuring (Details) (USD $)	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014	Mar. 30, 2013
Restructuring Cost and Reserve [Line Items]
Recorded restructuring charges - less than	$ 4,894,000	$ 11,000
Restructuring Reserve [Roll Forward]
Balance at beginning of the period	182,000	532,000
Restructuring Charges	4,893,000	9,000
Cash Payments	(148,000)	(290,000)
Adjustments to prior restructuring costs	1,000	2,000
Balance at the end of the period	4,928,000	253,000
Severance and related
Restructuring Reserve [Roll Forward]
Balance at beginning of the period	0	17,000
Restructuring Charges	4,893,000	0
Cash Payments	0	(8,000)
Adjustments to prior restructuring costs	0	(9,000)
Balance at the end of the period	4,893,000	0
Lease termination
Restructuring Reserve [Roll Forward]
Balance at beginning of the period	43,000	368,000
Restructuring Charges	0	0
Cash Payments	(9,000)	(266,000)
Adjustments to prior restructuring costs	1,000	11,000
Balance at the end of the period	35,000	113,000
Other
Restructuring Reserve [Roll Forward]
Balance at beginning of the period	139,000	147,000
Restructuring Charges	0	9,000
Cash Payments	(139,000)	(16,000)
Adjustments to prior restructuring costs	0	0
Balance at the end of the period	0	140,000
2012 restructuring plan
Restructuring Cost and Reserve [Line Items]
Recorded restructuring charges - less than			4,900,000
Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	20,000,000
Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 25,000,000