Summary of Impact of Deferred Plan (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Employee Benefit Plan [Line Items]
Increase (reduction) to cost of revenue and operating expense	$ 7,498	$ 2,449	$ 9,426
Other income (expense), net	7,498	2,449	8,810
Net increase (decrease) to net income			$ (616)