Stock Repurchase Program - Stock Repurchase Activities (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Stock Repurchase Program [Abstract]
Shares repurchased (in shares)	1,509	1,627	4,411	4,401
Total cost of the repurchased shares	$ 132,000	$ 120,000	$ 387,000	$ 300,000
Reissuance of treasury stock (in shares)	1,107	1,316	2,527	3,188