Pre-Production Costs Related to Long-Term Supply Arrangements (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 23, 2012	Sep. 29, 2013	Sep. 23, 2012	Dec. 30, 2012
Unamortized Preproduction Costs [Abstract]
Preproduction costs	$ 57,971,000		$ 57,971,000		$ 51,638,000
Accumulated amortization	(44,253,000)		(44,253,000)		(38,667,000)
Net preproduction costs	13,718,000		13,718,000		12,971,000
Deferred Revenue [Abstract]
Accrued expenses	5,821,000		5,821,000		5,688,000
Other non-current liabilities	2,919,000		2,919,000		3,443,000
Total deferred tooling revenues	8,740,000		8,740,000		9,131,000
Deferred Revenue, Revenue Recognized	$ 2,300,000	$ 2,100,000	$ 7,200,000	$ 6,100,000