Retirement Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	4 Months Ended
	Jan. 19, 2014	Jan. 20, 2013
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,499	$ 3,308
Interest cost	7,152	6,963
Expected return on plan assets	(7,536)	(6,989)
Actuarial loss	1,364	5,488
Amortization of unrecognized prior service cost	83	83
Net periodic benefit cost	3,562	8,853
Postretirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	504	488
Actuarial loss	167	243
Net periodic benefit cost	$ 671	$ 731