Stock Repurchase Activities (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Apr. 30, 2013		Apr. 30, 2012		Apr. 30, 2013		Apr. 30, 2012
Stock Repurchase Program
Shares repurchased	1,003		624		1,003		2,474
Average purchase price per share	$ 34.90		$ 32.04		$ 34.90		$ 29.64
Aggregate purchase price	$ 34,998	[1]	$ 20,000	[1]	$ 34,998	[1]	$ 73,335	[1]
Reissuance of treasury stock	2,639		3,631		3,709		6,116

[1] Includes $33.3 million from the settlement of the Company's September 2011 ASR equity forward contract and $20.0 million from the January 2012 ASR referenced above that was settled in the second quarter of fiscal 2012.