Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Unrealized hedging gains (losses), income tax expense (benefit)	$ 2,079	$ (2,914)	$ 1,907
Reclassification of realized (gains)losses to net income ,income tax expense (benefit)	(1,132)	1,281	(47)
Income tax effect on employee benefit plans to net income, income tax expense (benefit)	$ (9,082)	$ (8,964)	$ (1,019)