Accumulated Other Comprehensive Income (Loss) (Changes in AOCIL by Component) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
AOCIL Attributable to Parent, Net of Tax [Roll Forward]
Accumulated foreign currency translation at beginning of period	$ (110,626)	$ (72,788)
Other comprehensive income (loss), before reclassifications - Foreign currency translation	28,301	(37,838)
Amounts reclassified from AOCIL - Foreign currency translation	(841)	0
Other comprehensive income (loss) - Foreign currency translation	27,460	(37,838)
Accumulated foreign currency translation at end of period	(83,166)	(110,626)	$ (72,788)
Accumulated retirement liability at beginning of period	(321,094)	(266,910)
Other comprehensive income (loss) before reclassification - Retirement liability	45,222	(72,094)
Amounts reclassified from AOCIL - Retirement liability	24,007	17,910
Other comprehensive income (loss) - Retirement liability	69,229	(54,184)	(51,926)
Accumulated retirement liability at end of period	(251,865)	(321,094)	(266,910)
Accumulated gain (loss) on derivatives at beginning of period	(3,341)	(2,037)
Other comprehensive income (loss) before reclassification - Derivatives	(1,078)	(4,227)
Amounts reclassified from AOCIL - Derivatives	3,959	2,923
Other comprehensive income (loss) - Derivatives	2,881	(1,304)	(929)
Accumulated gain (loss) on derivatives at end of period	(460)	(3,341)	(2,037)
Accumulated other comprehensive income (loss) at beginning of period	(435,061)	(341,735)
Other comprehensive income (loss) before reclassifications - Total	72,445	(114,159)
Amounts reclassified from AOCIL - Total	27,125	20,833
Other comprehensive income (loss), net of tax	99,570	(93,326)	(134,897)
Accumulated other comprehensive income (loss) at end of period	$ (335,491)	$ (435,061)	$ (341,735)