Income Taxes (Deferred Tax Assets And Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands	Sep. 27, 2015	Sep. 28, 2014
Income Tax Disclosure [Abstract]
Accrued pension and postretirement benefits	$ 92,456	$ 77,170
Accrued insurance	13,245	12,874
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	6,412	3,090
Accrued vacation pay expense	2,193	2,132
Deferred income	1,417	1,436
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses	23,982	25,391
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Restructuring Charges	11,471	12,686
Other reserves and allowances	1,584	1,303
Tax loss and tax credit carryforwards	14,081	10,705
Leasing transactions	11,442	7,201
Share-based compensation	9,331	9,416
Other, net	12,238	1,418
Total gross deferred tax assets	199,852	164,822
Valuation allowance	(11,563)	(8,624)
Total net deferred tax assets	188,289	156,198
Property and equipment, principally due to differences in depreciation	(38,403)	(38,362)
Intangible assets	(30,132)	(28,149)
Deferred Tax Liabilities, Other	(1,568)	(2,069)
Total gross deferred tax liabilities	(70,103)	(68,580)
Net deferred tax assets	$ 118,186	$ 87,618