Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jul. 01, 2012	Jan. 01, 2012	Jul. 03, 2011
Derivative financial instruments
Public debt securities, carrying value	$ (523,301)	$ (523,219)	$ (523,139)
Carrying Amount [Member]
Derivative financial instruments
Public debt securities, carrying value	(523,301)	(523,219)	(523,139)
Deferred compensation plan assets	12,164	10,709	11,133
Deferred compensation plan liabilities	(12,164)	(10,709)	(11,133)
Cost and fair value aluminum hedging agreements	0	0	4,450
Fair Value [Member]
Derivative financial instruments
Public debt securities, fair value	(579,386)	(576,127)	(569,324)
Deferred compensation plan assets	12,164	10,709	11,133
Deferred compensation plan liabilities	(12,164)	(10,709)	(11,133)
Cost and fair value aluminum hedging agreements	$ 0	$ 0	$ 4,450