Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	1 Months Ended
	Jul. 31, 2012	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012 U.S. Plan	Sep. 30, 2011 U.S. Plan	Sep. 28, 2012 U.S. Plan	Sep. 30, 2011 U.S. Plan	Sep. 28, 2012 UK Plan	Sep. 30, 2011 UK Plan	Sep. 28, 2012 UK Plan	Sep. 30, 2011 UK Plan	Jul. 01, 2011 Previously reported U.S. Commercial Products	Jul. 31, 2012 Final assessment U.S. Commercial Products
Defined Benefit Plan Disclosure [Line Items]
Multiemployer pension plan early withdrawal penalty settlement period	20 years
Service cost						$ 19	$ 10	$ 57	$ 30	$ 0	$ 0	$ 0	$ 0
Interest cost						128	128	384	384	590	598	1,770	1,783
Expected return on assets						(144)	(140)	(432)	(420)	(418)	(464)	(1,254)	(1,384)
Recognized actuarial net loss						62	11	186	32	24	0	70	0
Total Company defined benefit plan						65	9	195	26	196	134	586	399
Multiemployer benefit expense						308	352	884	925	0	0	0	0
Multiemployer pension withdrawal penalty		39	0	39	1,200	39	0	39	1,200	0	0	0	0	1,200	1,200
Net periodic pension cost						$ 412	$ 361	$ 1,118	$ 2,151	$ 196	$ 134	$ 586	$ 399