Accumulated Other Comprehensive Income (Loss) (Changes in AOCIL by Component) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
AOCIL Attributable to Parent, Net of Tax [Roll Forward]
Accumulated foreign currency translation at beginning of period	$ (83,166)	$ (110,626)
Other comprehensive income (loss), before reclassifications - Foreign currency translation	(17,663)	28,301
Amounts reclassified from AOCIL - Foreign currency translation	1,414	(841)
Other comprehensive income (loss) - Foreign currency translation	(16,249)	27,460
Accumulated foreign currency translation at end of period	(99,415)	(83,166)	$ (110,626)
Accumulated retirement liability at beginning of period	(251,865)	(321,094)
Other comprehensive income (loss) before reclassification - Retirement liability	5,557	45,222
Amounts reclassified from AOCIL - Retirement liability	21,200	24,007
Other comprehensive income (loss) - Retirement liability	26,757	69,229
Accumulated retirement liability at end of period	(272,317)	(251,865)	(321,094)
Accumulated gain (loss) on derivatives at beginning of period	(460)	(3,341)
Other comprehensive income (loss) before reclassification - Derivatives	(830)	(1,078)
Amounts reclassified from AOCIL - Derivatives	709	3,959
Other comprehensive income (loss) - Derivatives	(121)	2,881
Accumulated gain (loss) on derivatives at end of period	(449)	(460)	(3,341)
Accumulated other comprehensive income (loss) at beginning of period	(335,491)	(435,061)
Other comprehensive income (loss) before reclassifications - Total	(12,936)	72,445
Amounts reclassified from AOCIL - Total	23,323	27,125
Other comprehensive income (loss), net of tax	10,387	99,570
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings	(47,077)	0	0
Accumulated other comprehensive income (loss) at end of period	(372,181)	$ (335,491)	$ (435,061)
Accumulated foreign currency translation
AOCIL Attributable to Parent, Net of Tax [Roll Forward]
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings	0
Accumulated retirement liability
AOCIL Attributable to Parent, Net of Tax [Roll Forward]
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings	(47,209)
Accumulated gain (loss) on derivatives
AOCIL Attributable to Parent, Net of Tax [Roll Forward]
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings	$ 132