Income Taxes (Details Textual) (USD $)	12 Months Ended
Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, interest and penalties accured	$ 1,400,000	$ 1,100,000
Unrecognized tax benefits, interest and penalties (benefit) expense	300,000	(300,000)	200,000
Net operating loss carryforwards subject to expiration	2,800,000,000
Income tax credit carryforwards subject to expiration	100,000,000
Cumulative tax benefit credited to additional paid in capital, equity compensation and call spread option	$ 78,000,000

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References+ Details

This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

+ References+ Details

- Definition

This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

+ References+ Details