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Investments (Equity method investees - Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Oct. 31, 2020
Jul. 31, 2020
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Schedule Of Equity Method Investments [Line Items]          
Equity method investment carrying value $ 11,527,000   $ 11,527,000 $ 139,510,000  
Impairment loss on investment     16,600,000    
Dividends received from affiliates     $ 7,433,000 $ 10,927,000 $ 12,243,000
Hexavest [Member]          
Schedule Of Equity Method Investments [Line Items]          
Equity method investment ownership percentage 49.00%   49.00% 49.00%  
Equity method investment carrying value $ 11,356,000   $ 11,356,000 $ 136,028,000  
Equity securities, fair value 11,400,000 $ 32,700,000 11,400,000    
Impairment loss on investment $ 21,700,000 $ 100,500,000 $ 122,200,000    
Hexavest [Member] | Measurement Input, Long Term Projected Revenue Growth Rate [Member]          
Schedule Of Equity Method Investments [Line Items]          
Equity method investment, measurement input 3.00% 3.00% 3.00%    
Hexavest [Member] | Measurement Input, Discount Rate [Member]          
Schedule Of Equity Method Investments [Line Items]          
Equity method investment, measurement input 17.00% 14.50% 17.00%    
Hexavest [Member] | Measurement Input Ebitda Multiple [Member]          
Schedule Of Equity Method Investments [Line Items]          
Equity method investment, measurement input 6.00% 6.50% 6.00%    
Private Equity Partnership [Member]          
Schedule Of Equity Method Investments [Line Items]          
Equity method investment ownership percentage 7.00%   7.00% 7.00%  
Equity method investment carrying value $ 200,000   $ 200,000 $ 3,500,000