Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jul. 01, 2012	Jan. 01, 2012	Jul. 03, 2011
Summary of inventory
Finished products	$ 45,958	$ 33,394	$ 46,398
Manufacturing materials	11,285	14,061	10,777
Plastic shells, plastic pallets and other inventories	19,533	18,703	17,982
Total inventories	$ 76,776	$ 66,158	$ 75,157