Investment Securities, Trading (Details) (USD $)	12 Months Ended
	Oct. 31, 2014 Number	Oct. 31, 2013 Number	Oct. 31, 2012
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	$ 381,045,000	$ 235,524,000
Trading securities net unrealized gain	(6,900,000)	16,500,000	12,100,000
Number of seeded sponsored funds	15	15
Number of seeded separately managed accounts	1	15
Short Term Debt Investment [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	156,972,000	20,116,000
Equity Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	140,249,000	117,758,000
Debt Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	$ 83,824,000	$ 97,650,000