Accumulated Other Comprehensive Income (Loss) (Changes in AOCI by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated foreign currency translation at beginning of period			$ (83,166)
Other comprehensive income (loss) before reclassifications - Foreign currency translation			(10,101)
Amounts reclassified from AOCIL - Foreign currency translation			0
Other comprehensive income (loss) - Foreign currency translation			(10,101)
Accumulated foreign currency translation at end of period	$ (93,267)		(93,267)
Accumulated retirement liability at beginning of period			(251,865)
Other comprehensive income (loss) before reclassifications - Retirement liability			330
Amounts reclassified from AOCIL - Retirement liability	5,528	$ 5,910	15,688	$ 17,921
Other comprehensive income (loss) retirement liability			16,018
Accumulated retirement liability at end of period	(283,056)		(283,056)
Accumulated loss on derivatives at beginning of period			(460)
Other comprehensive income (loss) before reclassification - Derivatives	(776)	(6)	(640)	(976)
Amounts reclassified from AOCIL - Derivatives	29	1,019	548	3,809
Other comprehensive income (loss) - Derivatives			(92)
Accumulated loss on derivatives at end of period	(420)		(420)
Accumulated other comprehensive loss at beginning of period			(335,491)
Other comprehensive income (loss) before reclassifications - Total			(10,411)
Amounts reclassified from AOCIL - Total			16,236
Other comprehensive income (loss), net of tax			5,825
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings	0	$ 0	(47,077)	$ 0
Accumulated other comprehensive loss at end of period	$ (376,743)		(376,743)
Accumulated foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings			0
Accumulated retirement liability
AOCI 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
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings			$ 132