Stock Repurchase Program - Stock Repurchase Activities (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Stock Repurchase Program [Abstract]
Shares repurchased (in shares)	1,627	2,525	4,401	6,889
Total cost of the repurchased shares	$ 120,000	$ 120,000	$ 300,000	$ 320,000
Reissuance of treasury stock (in shares)	1,316	1,708	3,188	3,169