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Investments in subsidiaries - Narrative (Details) - CAD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 13, 2024
Jul. 03, 2024
Oct. 10, 2023
Disclosure of detailed information about business combination [line items]            
Net assets acquired $ 390,249,000 $ 390,249,000        
Additional recognition, acquisition costs   2,348,000        
Expenses for acquisition-related and integration costs   5,866,000 $ 53,401,000      
Integration costs     53,401,000      
Professional fees            
Disclosure of detailed information about business combination [line items]            
Acquisition-related costs   2,437,000        
Vacating leased premises            
Disclosure of detailed information about business combination [line items]            
Integration costs   947,000 10,774,000      
Redundancy costs            
Disclosure of detailed information about business combination [line items]            
Integration costs   653,000 23,226,000      
Other integration costs            
Disclosure of detailed information about business combination [line items]            
Integration costs   1,829,000 $ 19,401,000      
Momentum Industries Holdings, LLC            
Disclosure of detailed information about business combination [line items]            
Net assets acquired           $ 53,341,000
Celero Solutions (Celero)            
Disclosure of detailed information about business combination [line items]            
Net assets acquired         $ 19,067,000  
Aeyon            
Disclosure of detailed information about business combination [line items]            
Net assets acquired 317,841,000 317,841,000   $ 317,841,000    
Revenue of combined entity as if combination occurred at beginning of period   265,000,000        
Profit (loss) of combined entity as if combination occurred at beginning of period   $ 8,000,000        
Revenue of acquiree since acquisition date 12,000,000          
Profit (loss) of acquiree since acquisition date $ 500,000