Investments (Summary of Investments in Equity Method Investees) (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Oct. 31, 2018
Schedule Of Equity Method Investments [Line Items]
Total carrying value	$ 139,510	$ 141,506
Hexavest [Member]
Schedule Of Equity Method Investments [Line Items]
Equity in net assets of Hexavest	5,500	6,000
Definite-lived intangible assets	19,500	21,300
Goodwill	116,300	116,400
Deferred tax liability	(5,300)	(5,700)
Total carrying value	$ 136,000	$ 138,000