Retirement Plans (Components Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands		4 Months Ended
		Jan. 22, 2017	Jan. 17, 2016
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost		$ 6,996	$ 7,440
Service cost		673	1,616
Expected return on plan assets		(8,659)	(6,694)
Actuarial loss	[1]	1,881	1,257
Amortization of unrecognized prior service cost	[1]	47	74
Net periodic benefit cost		938	3,693
Postretirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost		309	389
Actuarial loss	[1]	50	67
Net periodic benefit cost		$ 359	$ 456

[1] (1)Amounts were reclassified from accumulated OCI into net earnings as a component of selling, general and administrative expenses.