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Investments in subsidiaries - Narrative (Details)
 12 Months Ended
Sep. 30, 2025
CAD ($)
Aug. 28, 2025
CAD ($)
employee
Mar. 24, 2025
employee
Mar. 20, 2025
employee
Feb. 24, 2025
CAD ($)
employee
Dec. 13, 2024
CAD ($)
employee
Sep. 30, 2024
CAD ($)
Disclosure of detailed information about business combination [line items]              
Net assets acquired $ 1,931,252,000           $ 390,249,000
Additional recognition, acquisition costs 11,510,000            
Daugherty              
Disclosure of detailed information about business combination [line items]              
Net assets acquired 343,024,000         $ 343,024,000  
Number of professionals employed | employee           1,100  
Revenue of acquiree since acquisition date 220,000,000            
Profit (loss) of acquiree since acquisition date 22,000,000            
Revenue of combined entity as if combination occurred at beginning of period 1,120,000,000            
Profit (loss) of combined entity as if combination occurred at beginning of period 46,000,000            
BJSS              
Disclosure of detailed information about business combination [line items]              
Net assets acquired 1,255,577,000       $ 1,255,577,000    
Number of professionals employed | employee         2,400    
Revenue of acquiree since acquisition date 299,000,000            
Profit (loss) of acquiree since acquisition date 24,000,000            
Revenue of combined entity as if combination occurred at beginning of period 1,120,000,000            
Profit (loss) of combined entity as if combination occurred at beginning of period 46,000,000            
Novatec Holding GmbH              
Disclosure of detailed information about business combination [line items]              
Number of professionals employed | employee       300      
Momentum Technologies Inc.              
Disclosure of detailed information about business combination [line items]              
Number of professionals employed | employee     250        
Apside              
Disclosure of detailed information about business combination [line items]              
Net assets acquired 229,890,000 $ 229,890,000          
Number of professionals employed | employee   2,500          
Revenue of acquiree since acquisition date 32,000,000            
Profit (loss) of acquiree since acquisition date 0            
Revenue of combined entity as if combination occurred at beginning of period 1,120,000,000            
Profit (loss) of combined entity as if combination occurred at beginning of period 46,000,000            
Aeyon              
Disclosure of detailed information about business combination [line items]              
Net assets acquired             $ 317,841,000
Increase (decrease) in goodwill $ 47,507,000