Related Party Transactions (Details) (USD $)	3 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Oct. 31, 2012
Sponsored Funds [Abstract]
Investment advisory and administrative fees	$ 192,192,000	$ 183,484,000
Distribution fees	20,073,000	20,477,000
Service fees	31,130,000	32,299,000
Shareholder services fees	540,000	597,000
Other revenue	135,000	0
Total	244,070,000	236,857,000
Investment advisory fees waived by the Company	2,800,000	2,400,000
Proceeds from sales	20,816,000	7,202,000
Net realized gains	4,909,000	63,000
Related party expenses	5,100,000	4,400,000
Related party accounts receivable	86,200,000		84,400,000
Employee Loan Program
Maximum loan amount available under the plan	$ 10,000,000
Minimum fixed borrowing rate under the plan	0.90%
Maximum fixed borrowing rate under the plan	5.00%