Derivative Financial Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 30, 2012	Jan. 01, 2012
Summary of fair values and classification in the consolidated balance sheets of derivative instruments
Total	$ 1,062	$ 0
Commodity hedges [Member] | Fair market value [Member] | Prepaid expenses and other current assets [Member]
Summary of fair values and classification in the consolidated balance sheets of derivative instruments
Total	500	0
Commodity hedges [Member] | Unamortized cost [Member] | Prepaid expenses and other current assets [Member]
Summary of fair values and classification in the consolidated balance sheets of derivative instruments
Total	$ 562	$ 0