Investment Securities, Trading (Details) (USD $)	3 Months Ended		6 Months Ended
	Apr. 30, 2014 Number	Apr. 30, 2013 Number	Apr. 30, 2014 Number	Apr. 30, 2013 Number	Oct. 31, 2013
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	$ 404,164,000		$ 404,164,000		$ 235,524,000
Trading securities net unrealized gain	6,900,000	6,400,000	1,900,000	15,900,000
Number of seeded sponsored funds	3	9	3	9
Number of seeded separately managed accounts		14		14
Short Term Debt Investment [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	192,509,000		192,509,000		20,116,000
Equity Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	120,681,000		120,681,000		117,758,000
Debt Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	$ 90,974,000		$ 90,974,000		$ 97,650,000