Retirement Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	4 Months Ended
	Jan. 20, 2013	Jan. 22, 2012
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3,308	$ 2,900
Interest cost	6,963	6,966
Expected return on plan assets	(6,989)	(6,149)
Actuarial loss	5,488	3,819
Amortization of unrecognized prior service cost	83	133
Net periodic benefit cost	8,853	7,669
Postretirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	19
Interest cost	488	497
Actuarial loss	243	27
Net periodic benefit cost	$ 731	$ 543