Investments (Equity Method Investees Narrative) (Details) - USD ($)	3 Months Ended
Jan. 31, 2020	Jan. 31, 2019	Oct. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Equity method investment carrying value	$ 138,454,000		$ 139,510,000
Impairment loss on investment	0	$ 0
Dividends received from affiliates	$ 2,540,000	$ 2,895,000
Hexavest [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment ownership percentage	49.00%		49.00%
Equity method investment carrying value	$ 134,953,000		$ 136,028,000
Private Equity Partnership [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method investment ownership percentage	7.00%		7.00%
Equity method investment carrying value	$ 3,500,000		$ 3,500,000

Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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