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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2012
Apr. 30, 2011
Oct. 31, 2011
Tax Benefits potential Interest and Penalties          
Tax Benefits potential Interest and Penalties $ 0 $ 1,250 $ 3,000 $ 2,500  
Tax Benefit Amount Accrued for potential Interest and Penalties          
Tax Benefit Amount Accrued for potential Interest and Penalties $ 29,500   $ 29,500   $ 29,200