Condensed Consolidated Statements of Comprehensive Income (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 84,214	$ 69,388	$ 195,976	$ 161,487
Components of other comprehensive income (loss):
Translation adjustments	(8,148)	(12,003)	586	(42,564)
Amortization of prior service cost and net actuarial losses, net of tax	1,743	2,045	5,231	6,333
Total other comprehensive income (loss)	(6,405)	(9,958)	5,817	(36,231)
Total comprehensive income	$ 77,809	$ 59,430	$ 201,793	$ 125,256