Fair Values of Financial Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 30, 2012	Jan. 01, 2012
Level 1 [Member]
Assets
Deferred compensation plan assets	$ 13,011	$ 10,709
Liabilities
Deferred compensation plan liabilities	13,011	10,709
Level 1 [Member] | Commodity hedges [Member]
Assets
Commodity hedging agreements	0	0
Level 2 [Member]
Assets
Deferred compensation plan assets	0	0
Liabilities
Deferred compensation plan liabilities	0	0
Level 2 [Member] | Commodity hedges [Member]
Assets
Commodity hedging agreements	$ 500	$ 0