Retirement Plans (Components Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Sep. 28, 2014
Qualified Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4,479	$ 7,592	$ 7,633
Interest cost	20,926	19,750	20,196
Expected return on plan assets	(21,756)	(23,273)	(24,492)
Actuarial loss	2,828	8,278	3,575
Net periodic benefit cost	6,477	12,347	6,912
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	773	676	490
Interest cost	3,253	2,945	3,049
Actuarial loss	1,259	1,134	859
Amortization of unrecognized prior service cost	240	269	269
Net periodic benefit cost	5,525	5,024	4,667
Postretirement Health Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	1,263	1,196	1,639
Actuarial loss	219	182	542
Net periodic benefit cost	$ 1,482	$ 1,378	$ 2,181