Retirement Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Cost of VERP	$ 0	$ 0	$ (6,167)
Qualified Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	7,633	10,210	9,068
Interest cost	20,196	19,964	19,891
Expected return on plan assets	(24,492)	(22,715)	(20,332)
Actuarial loss	3,575	15,665	11,871
Cost of VERP	0	0	(6,167)
Net periodic benefit cost	6,912	23,124	26,665
Non-Qualified Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	490	543	466
Interest cost	3,049	2,664	3,056
Actuarial loss	859	2,170	1,140
Amortization of unrecognized prior service cost	269	269	432
Net periodic benefit cost	4,667	5,646	5,094
Postretirement Health Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	61
Interest cost	1,639	1,586	1,617
Actuarial loss	542	791	89
Net periodic benefit cost	$ 2,181	$ 2,377	$ 1,767