Condensed Consolidated Statements of Comprehensive Income (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 92,079	$ 91,923	$ 144,083	$ 140,490
Components of other comprehensive income (loss):
Foreign currency translation adjustments	(21,227)	(9,064)	(18,434)	7,399
Amortization of prior service cost and net actuarial losses, net of tax	3,898	1,598	7,127	2,950
Total other comprehensive income (loss)	(17,329)	(7,466)	(11,307)	10,349
Total comprehensive income	$ 74,750	$ 84,457	$ 132,776	$ 150,839