Stock Repurchase Program - Stock Repurchase Activities (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Jul. 31, 2016		Jul. 31, 2015	Jul. 31, 2016		Jul. 31, 2015
Stock Repurchase Program
Shares repurchased (in shares)	2,525	[1]	678	6,889	[1]	3,968
Total cost of the repurchased shares	$ 120,000	[1]	$ 36,000	$ 320,000	[1]	$ 180,000
Reissuance of treasury stock (in shares)	1,708		1,553	3,169		3,931

[1] Does not include the 351,170 shares and $25.0 million equity forward contract, respectively, from the May 2016 ASR settled in August 2016.