Stock Repurchase Program - Stock Repurchase Activities (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016		Apr. 30, 2015
Stock Repurchase Program
Shares repurchased (in shares)	515	0	4,364	[1]	3,290
Total cost of the repurchased shares	$ 20,000	$ 0	$ 200,000	[1]	$ 144,000
Reissuance of treasury stock (in shares)	1,261	1,597	1,462		2,379

[1] Does not include the final 517,410 shares and $20.0 million equity forward contract, respectively, from the December 2015 ASRs settled in May 2016.