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Amortization, depreciation and impairment (Details) - CAD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Disclosure of attribution of expenses by nature to their function [line items]    
Impairment of intangible assets $ 11,574,000  
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss 536,859,000 $ 519,648,000
Amortization of contract costs related to incentives (presented as a reduction of revenue) 2,806,000 2,793,000
Amortization of deferred financing fees (presented in finance costs) 630,000 816,000
Amortization of premiums and discounts on investments related to funds held for clients (presented net as an increase of revenue) (1,584,000) (1,832,000)
Costs of services, selling and administrative    
Disclosure of attribution of expenses by nature to their function [line items]    
Depreciation of PP&E 134,818,000 142,653,000
Impairment of PP&E 115,000 0
Depreciation of right-of-use assets 126,615,000 143,030,000
Impairment of right-of-use assets 0 2,274,000
Amortization of contract costs related to transition costs 59,191,000 55,194,000
Impairment of contract costs related to transition costs 4,254,000 0
Amortization of intangible assets 185,741,000 162,971,000
Impairment of intangible assets 11,574,000 0
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss 522,308,000 506,122,000
Integration costs    
Disclosure of attribution of expenses by nature to their function [line items]    
Depreciation of PP&E 0 712,000
Impairment of PP&E 149,000 648,000
Impairment of right-of-use assets 0 5,143,000
Amortization of intangible assets 0 1,076,000
Cost optimization program    
Disclosure of attribution of expenses by nature to their function [line items]    
Impairment of PP&E 2,431,000 1,938,000
Impairment of right-of-use assets $ 10,119,000 $ 2,232,000