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Goodwill and Other Intangible Assets - Additional Information (Detail)
$ in Millions
12 Months Ended
Oct. 31, 2021
Jul. 31, 2021
CAD ($)
Oct. 31, 2020
Jul. 31, 2020
CAD ($)
Disclosure of intangible assets and goodwill [Line Items]        
Annual impairment of goodwill   $ 0   $ 0
Period of discounted cash flow method for calculating value in use 5-year      
Annual impairment of Indefinite life intangible assets   $ 0   $ 0
Bottom of range [member]        
Disclosure of intangible assets and goodwill [Line Items]        
Price earnings multiples used 10.0   10.0  
Terminal growth rate 3.00%   3.00%  
Cash flows discounted rate 10.00%   10.00%  
Top of range [member]        
Disclosure of intangible assets and goodwill [Line Items]        
Price earnings multiples used 12.5   11.5  
Terminal growth rate 5.00%   5.00%  
Cash flows discounted rate 12.00%   12.00%