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Amortization, depreciation and impairment (Details) - CAD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Disclosure of attribution of expenses by nature to their function [line items]    
Impairment of intangible assets $ 6,716,000 $ 11,574,000
Amortization of contract costs related to incentives (presented as a reduction of revenue) 4,170,000 2,806,000
Amortization of deferred financing fees (presented in finance costs) 575,000 630,000
Amortization of discounts on investments related to funds held for clients (presented net as an increase of revenue) (39,000) (1,584,000)
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss 614,266,000 536,859,000
Costs of services, selling and administrative    
Disclosure of attribution of expenses by nature to their function [line items]    
Depreciation of PP&E 134,243,000 134,818,000
Impairment of PP&E 0 115,000
Depreciation of right-of-use assets 138,240,000 126,615,000
Impairment of right-of-use assets 768,000 0
Amortization of contract costs related to transition costs 74,059,000 59,191,000
Impairment of contract costs related to transition costs 0 4,254,000
Amortization of intangible assets 231,639,000 185,741,000
Impairment of intangible assets 6,716,000 11,574,000
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss 585,665,000 522,308,000
Integration costs    
Disclosure of attribution of expenses by nature to their function [line items]    
Impairment of PP&E 360,000 149,000
Impairment of right-of-use assets 19,125,000 0
Restructuring program and cost optimization program    
Disclosure of attribution of expenses by nature to their function [line items]    
Impairment of PP&E 1,526,000 2,431,000
Impairment of right-of-use assets 2,656,000 10,119,000
Restructuring    
Disclosure of attribution of expenses by nature to their function [line items]    
Impairment of intangible assets $ 228,000 $ 0