Pre-Production Costs Related to Long-Term Supply Arrangements (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 24, 2012	Jun. 26, 2011	Jun. 24, 2012	Jun. 26, 2011	Dec. 25, 2011
Unamortized Preproduction Costs [Abstract]
Preproduction costs	$ 45,666,000		$ 45,666,000		$ 42,118,000
Accumulated amortization	(34,890,000)		(34,890,000)		(31,548,000)
Net preproduction costs	10,776,000		10,776,000		10,570,000
Deferred Revenue [Abstract]
Accrued expenses	4,735,000		4,735,000		5,158,000
Other non-current liabilities	1,874,000		1,874,000		2,401,000
Total deferred tooling revenues	6,609,000		6,609,000		7,559,000
Deferred tooling revenue, revenue recognized	$ 1,800,000	$ 2,100,000	$ 3,900,000	$ 4,600,000