Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Oct. 02, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 121,371	$ 135,332	$ 124,073
Net change in fair value of derivatives	18,769	19,768	(25,439)
Net loss reclassified to earnings	3,455	5,070	4,048
Cash flow hedges, Net change in fair value of derivatives	22,224	24,838	(21,391)
Tax effect	(5,725)	(9,592)	8,281
Cash flow hedges	16,499	15,246	(13,110)
Actuarial gains (losses) arising during the period	(31,478)	(49,025)	(71,971)
Actuarial losses and prior service cost reclassified to earnings	4,988	6,429	4,546
Total recognized in OCI	36,466	55,454	(67,425)
Tax effect	(9,544)	(21,418)	26,087
Unrecognized periodic benefit costs	26,922	34,036	(41,338)
Foreign currency translation adjustments	6	(35)	(70)
Tax effect	2	(13)	(27)
Derecognition of foreign currency translation adjustments due to sale	100
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	80	(22)	(43)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	43,501	49,260	(54,491)
Comprehensive income	$ 164,872	$ 184,592	$ 69,582