Related Party Transactions (Tables)
 12 Months Ended
Oct. 31, 2012
Related Party Transactions Table [Abstract]  
Summary of related party revenue transactions
 (in thousands) 2012 2011 2010
 Investment advisory and administrative fees$ 744,351$ 768,430$ 669,017
 Distribution fees  80,920  92,770  91,750
 Service fees  126,345  144,530  139,741
 Shareholder services fees  2,411  2,188  2,255
 Total$ 954,027$ 1,007,918$ 902,763
Summary of sales proceeds and net realized (losses) gains earned on investments
 (in thousands) 2012 2011 2010
 Proceeds from sales $ 60,726$ 61,866$ 32,586
 Net realized (losses) gains  (92)  586  3,048