Intangible Assets 3 (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Oct. 31, 2016
Amortizing intangible assets:
Accumulated amortization	$ (100,286)	$ (95,751)
Total Intangible assets
Gross intangible assets	194,576	142,560
Accumulated amortization	(100,286)	(95,751)
Intangible assets, net	94,290	46,809
Mutual Fund Management Contract Acquired [Member]
Non-amortizing intangible assets:
Net carrying amount	54,408	6,708
Client Relationships Acquired [Member]
Amortizing intangible assets:
Gross carrying amount	134,247	133,927
Accumulated amortization	(99,159)	(94,873)
Net carrying amount	35,088	39,054
Total Intangible assets
Accumulated amortization	(99,159)	(94,873)
Intellectual Property Acquired [Member]
Amortizing intangible assets:
Gross carrying amount	1,025	1,025
Accumulated amortization	(419)	(385)
Net carrying amount	606	640
Total Intangible assets
Accumulated amortization	(419)	(385)
Trademark Acquired [Member]
Amortizing intangible assets:
Gross carrying amount	4,257	900
Accumulated amortization	(637)	(493)
Net carrying amount	3,620	407
Total Intangible assets
Accumulated amortization	(637)	$ (493)
Research System [Member]
Amortizing intangible assets:
Gross carrying amount	639
Accumulated amortization	(71)
Net carrying amount	568
Total Intangible assets
Accumulated amortization	$ (71)