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Investments in subsidiaries - Narrative (Details) - CAD ($)
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Oct. 10, 2023
Jul. 29, 2022
Jul. 18, 2022
May 31, 2022
May 25, 2022
Feb. 28, 2022
Oct. 28, 2021
Oct. 01, 2021
Disclosure of detailed information about business combination [line items]                    
Identifiable assets acquired (liabilities assumed) $ 658,618,000                  
Consideration paid 639,192,000                  
Additional recognition, acquisition costs 13,039,000                  
Expenses for acquisition-related and integration costs 53,401,000 $ 27,654,000                
Termination of employment costs 23,226,000 10,948,000                
Other integration costs 10,774,000 3,496,000                
Acquisition-related costs   3,094,000                
Integration costs   $ 24,560,000                
Umanis                    
Disclosure of detailed information about business combination [line items]                    
Identifiable assets acquired (liabilities assumed) 420,258,000         $ 303,896,000        
Percentage of voting equity interests acquired         90.00% 72.40%        
Consideration paid 420,258,000     $ 116,362,000            
Additional recognition, goodwill 19,060,000                  
Momentum Industries Holdings, LLC | Major business combination                    
Disclosure of detailed information about business combination [line items]                    
Identifiable assets acquired (liabilities assumed)     $ 50,492,000              
Array Holding Company, Inc                    
Disclosure of detailed information about business combination [line items]                    
Identifiable assets acquired (liabilities assumed)                   $ 60,337,000
CMC                    
Disclosure of detailed information about business combination [line items]                    
Identifiable assets acquired (liabilities assumed) 90,900,000               $ 90,900,000  
Consideration paid $ 79,291,000                  
Unico Computer Systems Pty Ltd                    
Disclosure of detailed information about business combination [line items]                    
Identifiable assets acquired (liabilities assumed)               $ 39,814,000    
Harwell Management                    
Disclosure of detailed information about business combination [line items]                    
Identifiable assets acquired (liabilities assumed)             $ 47,309,000