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Comprehensive Loss (Tables)
9 Months Ended
Jul. 31, 2011
Equity [Abstract]  
Comprehensive loss
                                 
    Quarter Ended July 31,     Nine Months Ended July 31,  
    2010     2011     2010     2011  
Net loss
  $ (109,855 )   $ (31,450 )   $ (253,197 )   $ (173,192 )
Change in unrealized gain (loss) on available-for-sale securities, net of tax
          3       (458 )     378  
Change in unrealized gain (loss) on foreign currency forward contracts, net of tax
          (88 )           87  
Change in accumulated translation adjustments
    (728 )     (4,290 )     (1,263 )     903  
 
                       
Total comprehensive loss
  $ (110,583 )   $ (35,825 )   $ (254,918 )   $ (171,824 )