Retirement Plans (Components Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands		4 Months Ended
		Jan. 17, 2016	Jan. 18, 2015
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 1,616	$ 2,544
Interest cost		7,440	6,983
Expected return on plan assets		(6,694)	(7,161)
Actuarial loss	[1]	1,257	2,896
Amortization of unrecognized prior service cost	[1]	74	83
Net periodic benefit cost		3,693	5,345
Postretirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost		389	368
Actuarial loss	[1]	67	56
Net periodic benefit cost		$ 456	$ 424

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