Investments (Summary of equity method investees) (Details) - USD ($)	Oct. 31, 2020	Oct. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Total carrying value	$ 11,527,000	$ 139,510,000
Hexavest [Member]
Schedule Of Equity Method Investments [Line Items]
Equity in net assets of Hexavest	7,914,000	5,466,000
Definite-lived intangible assets	4,668,000	19,486,000
Goodwill	0	116,319,000
Deferred tax liability	(1,226,000)	(5,243,000)
Total carrying value	$ 11,356,000	$ 136,028,000