Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Reconciliation of change in gross unrecognized tax benefits
Balance, beginning of period	$ 104,669	$ 160,446	$ 171,366
Increase in benefit as a result of tax positions taken in prior years	5,000	8,168	14,251
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	5,489		15,675
Decrease in benefit as a result of resolution of uncertain tax positions	0	(17,954)
Decrease in benefit as a result of completion of tax audits	1,782	(33,370)
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	(32,385)	(12,621)	(40,846)
Balance, end of period	$ 80,991	$ 104,669	$ 160,446