Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	4 Months Ended
	Apr. 21, 2012	Apr. 23, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 37,943	$ 41,161
Pension and postretirement plans:
Amortization of prior service (credit) cost included in net income	(49)	(49)
Amortization of actuarial loss included in net income	906	507
Pension and postretirement plans, net of tax	857	458
Derivative instruments:
Net derivatives (loss) gain for the period	(7,009)	8,492
Loss (Gain) reclassified to net income	10,036	(13,295)
Derivative instruments, net of tax	3,027	(4,803)
Other comprehensive income, net of tax	3,884	(4,345)
Comprehensive income	$ 41,827	$ 36,816