Condensed Consolidated Statements of Comprehensive Income (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 49,988	$ 41,161
Components of other comprehensive income (loss):
Translation adjustments	(5,751)	(11,581)
Amortization of prior service cost and net actuarial losses, net of tax	1,691	1,631
Total other comprehensive income (loss)	(4,060)	(9,950)
Total comprehensive income	$ 45,928	$ 31,211