Acquisitions, Goodwill and Intangible Assets 3 (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Amortizing intangible assets:
Accumulated amortization	$ (58,807)	$ (50,811)
Intangible assets
Gross intangible assets	118,035	118,035
Accumulated amortization	(58,807)	(50,811)
Intangible assets, net	59,228	67,224
Mutual Fund Management Contract Acquired [Member]
Non-amortizing intangible assets:
Net carrying amount	6,708	6,708
Client Relationships Acquired [Member]
Amortizing intangible assets:
Gross carrying amount	110,327	110,327
Accumulated amortization	(58,681)	(50,749)
Net carrying amount	51,646	59,578
Weighted-average remaining amortization period (in years)	7 years	7 years 11 months
Intangible assets
Accumulated amortization	(58,681)	(50,749)
Intellectual Property Acquired [Member]
Amortizing intangible assets:
Gross carrying amount	1,000	1,000
Accumulated amortization	(126)	(62)
Net carrying amount	874	938
Weighted-average remaining amortization period (in years)	13 years 7 months	14 years 7 months
Intangible assets
Accumulated amortization	$ (126)	$ (62)