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Taxes (Tables)
9 Months Ended
Jul. 31, 2011
Taxes  
Provision (Benefit) for Income Taxes and Effective Tax Rates
                                 
     Three Months Ended
July 31,
    Nine Months Ended
July 31,
 
     2011     2010     2011     2010  
     (in thousands)     (in thousands)  

Income before income taxes

   $ 55,967      $ 47,747      $ 165,558      $ 158,962   

Provision (benefit) for income tax

   $ 3,885      $ 8,420      $ (15,864   $ (52,700

Effective tax rate

     6.9     17.6     (9.6 )%      (33.2 )%