Income Taxes (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2009
Valuation allowance against gross deferred tax assets:
Valuation allowance, beginning balance	$ 1,363,493	$ 1,198,067	$ 1,164,384
Additions	103,918	165,426	33,683
Deductions	0	0	0
Valuation allowance, ending balance	$ 1,467,411	$ 1,363,493	$ 1,198,067