Related Party Transactions (Tables)
12 Months Ended
Oct. 31, 2011
Related Party Transactions Table [Abstract]  
Summary of related party revenue transactions
   Years Ended October 31,
 (in thousands) 2011 2010 2009
 Investment advisory and administrative fees$ 768,430$ 669,017$ 535,895
 Distribution fees  92,770  91,750  76,990
 Service fees  144,530  139,741  116,331
 Shareholder services fees  2,188  2,255  2,123
 Total$ 1,007,918$ 902,763$ 731,339
Summary of sales proceeds and net realized gains earned on investments
   Years Ended October 31,
 (in thousands) 2011 2010 2009
 Proceeds from sales $ 61,866$ 32,586$ 6,699
 Net realized gains  586  3,048  1,562
 Total$ 62,452$ 35,634$ 8,261