Business Segments (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 29, 2013	Sep. 23, 2012		Sep. 29, 2013	Sep. 23, 2012		Dec. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Intercompany sales reclassification		$ 1,500,000			$ 2,300,000
Net sales	191,619,000	193,926,000		597,053,000	611,436,000
Property, plant and equipment, net	186,777,000			186,777,000			147,544,000
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	65,090,000	66,994,000	[1]	219,228,000	233,935,000	[1]
Property, plant and equipment, net	60,028,000			60,028,000			52,458,000
MEXICO
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	126,529,000	126,932,000	[1]	377,825,000	377,501,000	[1]
Property, plant and equipment, net	$ 126,749,000			$ 126,749,000			$ 95,086,000

[1] For the thirteen and thirty-nine weeks ended September 23, 2012, net sales totaling $1.5 million and $2.3 million, respectively, were reclassified from the U.S. to Mexico as a result of reallocating intercompany sales transactions that eliminate in consolidation.