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Cost of services, selling and administrative (Details) - CAD ($)
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Disclosure of attribution of expenses by nature to their function [line items]    
Salaries, other employee costs and contracted labour costs $ 11,184,452,000 $ 10,301,386,000
Hardware, software and data center related costs 957,218,000 866,883,000
Professional fees 268,322,000 293,452,000
Property costs 220,845,000 201,194,000
Amortization, depreciation and impairment (Note 24) 585,665,000 522,308,000
Other operating expenses 84,543,000 74,507,000
Costs of services, selling and administrative 13,301,045,000 12,259,730,000
R&D and other tax credits $ 173,042,000 134,911,000
Revision of Prior Period, Reclassification, Adjustment    
Disclosure of attribution of expenses by nature to their function [line items]    
Salaries, other employee costs and contracted labour costs   1,142,951,000
Professional fees   $ (1,142,951,000)