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Investments in subsidiaries - Narrative (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Jul. 29, 2022
Jul. 18, 2022
May 31, 2022
May 25, 2022
Feb. 28, 2022
Oct. 28, 2021
Oct. 01, 2021
May 03, 2021
Dec. 31, 2020
Disclosure of detailed information about business combination [line items]                      
Identifiable assets acquired (liabilities assumed) $ 658,618 $ 111,513                  
Consideration paid 639,192 104,148                  
Revenue of combined entity as if combination occurred at beginning of period 600,000                    
Profit (loss) of combined entity as if combination occurred at beginning of period 43,000                    
Expenses for acquisition-related and integration costs 27,654 7,371                  
Acquisition-related costs 3,094 293                  
Integration costs 24,560 7,078                  
Termination of employment costs 10,948 1,008                  
Other integration costs 13,612 $ 6,070                  
Array Holding Company, Inc                      
Disclosure of detailed information about business combination [line items]                      
Identifiable assets acquired (liabilities assumed)                 $ 60,337    
CMC                      
Disclosure of detailed information about business combination [line items]                      
Identifiable assets acquired (liabilities assumed) 90,900             $ 90,900      
Consideration paid 79,291                    
Revenue of acquiree since acquisition date 112,000                    
Profit (loss) of acquiree since acquisition date 5,000                    
Unico Computer Systems Pty Ltd                      
Disclosure of detailed information about business combination [line items]                      
Identifiable assets acquired (liabilities assumed)             $ 39,814        
Harwell Management                      
Disclosure of detailed information about business combination [line items]                      
Identifiable assets acquired (liabilities assumed)           $ 47,309          
Umanis                      
Disclosure of detailed information about business combination [line items]                      
Identifiable assets acquired (liabilities assumed) 420,258       $ 303,896            
Percentage of voting equity interests acquired       90.00% 72.40%            
Consideration paid 420,258   $ 116,362                
Revenue of acquiree since acquisition date 113,000                    
Profit (loss) of acquiree since acquisition date 9,000                    
Harris, Mackessy & Brennan, Inc                      
Disclosure of detailed information about business combination [line items]                      
Identifiable assets acquired (liabilities assumed)                     $ 30,340
Sense Corp                      
Disclosure of detailed information about business combination [line items]                      
Identifiable assets acquired (liabilities assumed)                   $ 81,173  
Prior fiscal year acquisitions                      
Disclosure of detailed information about business combination [line items]                      
Consideration paid $ 4,700