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Income Taxes (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Valuation allowance against gross deferred tax assets:
Valuation allowance, beginning balance	$ 1,467,411	$ 1,363,493	$ 1,198,067
Additions	21,583	103,918	165,426
Deductions	0	0	0
Valuation allowance, ending balance	$ 1,488,994	$ 1,467,411	$ 1,363,493

The sum of the portions of deferred tax assets as of the balance sheet date for which, based on the weight of available evidence, it is more likely than not will not be realized through future reductions of tax-based income.

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