Condensed Consolidated Statements of Comprehensive Income (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 94,884	$ 101,456	$ 290,674	$ 215,967
Components of other comprehensive income (loss):
Translation adjustments	(26,361)	27,126	(7,063)	27,224
Amortization of prior service cost and net actuarial losses, net of tax	2,796	2,199	7,118	5,598
Total other comprehensive income (loss)	(23,565)	29,325	55	32,822
Total comprehensive income	$ 71,319	$ 130,781	$ 290,729	$ 248,789