Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Oct. 31, 2011
Amortizing intangible assets:
Accumulated amortization	$ (56,808)	$ (50,811)
Intangible assets
Gross intangible assets	118,035	118,035
Accumulated amortization	(56,808)	(50,811)
Intangible assets, net	61,227	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	(56,698)	(50,749)
Net carrying amount	53,629	59,578
Intangible assets
Accumulated amortization	(56,698)	(50,749)
Intellectual Property Acquired [Member]
Amortizing intangible assets:
Gross carrying amount	1,000	1,000
Accumulated amortization	(110)	(62)
Net carrying amount	890	938
Intangible assets
Accumulated amortization	$ (110)	$ (62)