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Employee benefits - Defined benefit obligations (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance $ 148,245  
Current service cost 16,290 $ 14,165
Interest cost 4,221 6,101
Past service cost 2,521 0
Defined benefit liability (asset), ending balance 123,420 148,245
U.K.    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance (22,230)  
Defined benefit liability (asset), ending balance (55,084) (22,230)
France    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 95,366  
Defined benefit liability (asset), ending balance 99,215 95,366
GERMANY    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 42,816  
Defined benefit liability (asset), ending balance 44,080 42,816
Other    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 32,293  
Defined benefit liability (asset), ending balance 35,209 32,293
Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 897,948 774,654
Current service cost 16,290 14,165
Interest cost 41,181 41,686
Past service cost 2,521  
Business acquisitions 7,860  
Actuarial losses (gains) due to change in financial assumptions (79,982) 47,885
Actuarial losses (gains) due to change in demographic assumptions (11,620) 449
Actuarial (gains) losses due to experience (17,225) (6,315)
Plan participant contributions 221 248
Benefits paid from the plan (36,244) (31,751)
Benefits paid directly by employer (7,771) (5,721)
Foreign currency translation adjustment 38,092 (62,648)
Defined benefit liability (asset), ending balance 851,271 897,948
Present value of defined benefit obligation | Unfunded Plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 116,966  
Defined benefit liability (asset), ending balance 121,222 116,966
Present value of defined benefit obligation | Funded Plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 780,982  
Defined benefit liability (asset), ending balance 730,049 780,982
Present value of defined benefit obligation | U.K.    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 620,308 535,633
Current service cost 336 946
Interest cost 30,485 30,561
Past service cost 0  
Business acquisitions 0  
Actuarial losses (gains) due to change in financial assumptions (61,738) 29,444
Actuarial losses (gains) due to change in demographic assumptions (10,673) 0
Actuarial (gains) losses due to experience (10,443) (1,222)
Plan participant contributions 57 86
Benefits paid from the plan (32,269) (27,712)
Benefits paid directly by employer 0 0
Foreign currency translation adjustment 19,893 (52,572)
Defined benefit liability (asset), ending balance 555,956 620,308
Present value of defined benefit obligation | U.K. | Unfunded Plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 0  
Defined benefit liability (asset), ending balance 0 0
Present value of defined benefit obligation | U.K. | Funded Plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 620,308  
Defined benefit liability (asset), ending balance 555,956 620,308
Present value of defined benefit obligation | France    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 95,366 78,612
Current service cost 7,402 6,114
Interest cost 3,234 3,378
Past service cost 0  
Business acquisitions 7,860  
Actuarial losses (gains) due to change in financial assumptions (12,876) 10,088
Actuarial losses (gains) due to change in demographic assumptions (958) 111
Actuarial (gains) losses due to experience (6,719) (5,100)
Plan participant contributions 0 0
Benefits paid from the plan 0 0
Benefits paid directly by employer (2,793) (2,033)
Foreign currency translation adjustment 8,699 (4,196)
Defined benefit liability (asset), ending balance 99,215 95,366
Present value of defined benefit obligation | France | Unfunded Plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 95,366  
Defined benefit liability (asset), ending balance 99,215 95,366
Present value of defined benefit obligation | France | Funded Plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 0  
Defined benefit liability (asset), ending balance 0 0
Present value of defined benefit obligation | GERMANY    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 74,715 67,706
Current service cost 376 373
Interest cost 2,473 2,738
Past service cost 0  
Business acquisitions 0  
Actuarial losses (gains) due to change in financial assumptions (2,563) 4,948
Actuarial losses (gains) due to change in demographic assumptions 0 0
Actuarial (gains) losses due to experience (125) (787)
Plan participant contributions 0 0
Benefits paid from the plan (156) (503)
Benefits paid directly by employer (4,069) (3,192)
Foreign currency translation adjustment 6,435 (3,432)
Defined benefit liability (asset), ending balance 77,086 74,715
Present value of defined benefit obligation | GERMANY | Unfunded Plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 0  
Defined benefit liability (asset), ending balance 0 0
Present value of defined benefit obligation | GERMANY | Funded Plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 74,715  
Defined benefit liability (asset), ending balance 77,086 74,715
Present value of defined benefit obligation | Other    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 107,559 92,703
Current service cost 8,176 6,732
Interest cost 4,989 5,009
Past service cost 2,521  
Business acquisitions 0  
Actuarial losses (gains) due to change in financial assumptions (2,805) 3,405
Actuarial losses (gains) due to change in demographic assumptions 11 338
Actuarial (gains) losses due to experience 62 794
Plan participant contributions 164 162
Benefits paid from the plan (3,819) (3,536)
Benefits paid directly by employer (909) (496)
Foreign currency translation adjustment 3,065 (2,448)
Defined benefit liability (asset), ending balance 119,014 107,559
Present value of defined benefit obligation | Other | Unfunded Plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 21,600  
Defined benefit liability (asset), ending balance 22,007 21,600
Present value of defined benefit obligation | Other | Funded Plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit liability (asset), beginning balance 85,959  
Defined benefit liability (asset), ending balance $ 97,007 $ 85,959