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Intangible assets (Details) - CAD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Software | Acquired    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance $ 53,435,000  
Ending balance 63,067,000 $ 53,435,000
Software internally developed | Internally developed    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 35,038,000  
Ending balance 28,082,000 35,038,000
Business solutions | Acquired    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 22,185,000  
Ending balance 18,456,000 22,185,000
Business solutions | Internally developed    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 367,278,000  
Ending balance 383,834,000 367,278,000
Client relationships and backlog    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 145,167,000  
Ending balance 225,136,000 145,167,000
Beginning balance 623,103,000  
Impairment 11,574,000  
Ending balance 718,575,000 623,103,000
Cost | Software | Acquired    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 228,673,000 238,940,000
Additions 50,534,000 33,963,000
Additions - business acquisitions 69,000  
Measurement period adjustment   0
Disposals/retirements (26,301,000) (49,103,000)
Foreign currency translation adjustment 3,203,000 4,873,000
Ending balance 256,178,000 228,673,000
Cost | Software internally developed | Internally developed    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 110,225,000 104,486,000
Additions 7,720,000 9,130,000
Additions - business acquisitions 0  
Measurement period adjustment   0
Disposals/retirements (5,806,000) (3,900,000)
Foreign currency translation adjustment 931,000 509,000
Ending balance 113,070,000 110,225,000
Cost | Business solutions | Acquired    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 90,139,000 78,580,000
Additions 0 19,811,000
Additions - business acquisitions 0  
Measurement period adjustment   0
Disposals/retirements (9,672,000) (9,002,000)
Foreign currency translation adjustment 1,309,000 750,000
Ending balance 81,776,000 90,139,000
Cost | Business solutions | Internally developed    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 841,740,000 734,021,000
Additions 100,810,000 111,894,000
Additions - business acquisitions 0  
Measurement period adjustment   0
Disposals/retirements (20,221,000) 0
Foreign currency translation adjustment 5,968,000 (4,175,000)
Ending balance 928,297,000 841,740,000
Cost | Client relationships and backlog    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 1,248,069,000 1,231,393,000
Additions 0 0
Additions - business acquisitions 124,330,000  
Measurement period adjustment   (8,951,000)
Disposals/retirements 0 0
Foreign currency translation adjustment 39,762,000 25,627,000
Ending balance 1,412,161,000 1,248,069,000
Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance 2,518,846,000 2,387,420,000
Additions 159,064,000 174,798,000
Additions - business acquisitions 124,399,000  
Measurement period adjustment   (8,951,000)
Disposals/retirements (62,000,000) (62,005,000)
Foreign currency translation adjustment 51,173,000 27,584,000
Ending balance 2,791,482,000 2,518,846,000
Accumulated amortization and impairment | Software | Acquired    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (175,238,000) (189,639,000)
Disposals/retirements 26,301,000 49,103,000
Foreign currency translation adjustment (2,647,000) (4,227,000)
Amortization expense 40,088,000 30,475,000
Impairment 1,439,000  
Ending balance (193,111,000) (175,238,000)
Accumulated amortization and impairment | Software internally developed | Internally developed    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (75,187,000) (65,323,000)
Disposals/retirements 5,806,000 3,900,000
Foreign currency translation adjustment (666,000) (343,000)
Amortization expense 14,810,000 13,421,000
Impairment 131,000  
Ending balance (84,988,000) (75,187,000)
Accumulated amortization and impairment | Business solutions | Acquired    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (67,954,000) (73,094,000)
Disposals/retirements 9,672,000 9,002,000
Foreign currency translation adjustment (1,200,000) (588,000)
Amortization expense 3,838,000 3,274,000
Impairment 0  
Ending balance (63,320,000) (67,954,000)
Accumulated amortization and impairment | Business solutions | Internally developed    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (474,462,000) (408,298,000)
Disposals/retirements 20,221,000 0
Foreign currency translation adjustment (2,517,000) 2,889,000
Amortization expense 77,701,000 69,053,000
Impairment 10,004,000  
Ending balance (544,463,000) (474,462,000)
Accumulated amortization and impairment | Client relationships and backlog    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (1,102,902,000) (1,035,107,000)
Disposals/retirements 0 0
Foreign currency translation adjustment (34,819,000) (19,971,000)
Amortization expense 49,304,000 47,824,000
Impairment 0  
Ending balance (1,187,025,000) (1,102,902,000)
Accumulated amortization and impairment    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Beginning balance (1,895,743,000) (1,771,461,000)
Disposals/retirements 62,000,000 62,005,000
Foreign currency translation adjustment (41,849,000) (22,240,000)
Amortization expense 185,741,000 164,047,000
Impairment 11,574,000  
Ending balance $ (2,072,907,000) $ (1,895,743,000)