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Amortization, depreciation and impairment (Details) - CAD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Disclosure of attribution of expenses by nature to their function [abstract]    
Included in costs of services, selling and administrative $ 519,648,000 $ 474,622,000
Amortization of contract costs related to incentives (presented as a reduction of revenue) 2,793,000 2,201,000
Amortization of deferred financing fees (presented in finance costs) 816,000 829,000
Amortization of premiums and discounts on investments related to funds held for clients (presented net as a reduction (increase) of revenue) (1,832,000) 37,000
Costs of services, selling and administrative    
Disclosure of attribution of expenses by nature to their function [abstract]    
Depreciation of PP&E 142,653,000 133,651,000
Depreciation of right-of-use assets 143,030,000 141,295,000
Impairment 2,274,000 1,495,000
Amortization of contract costs related to transition costs 55,194,000 48,594,000
Amortization expense 162,971,000 139,940,000
Impairment 0 3,359,000
Included in costs of services, selling and administrative 506,122,000 468,334,000
Integration costs    
Disclosure of attribution of expenses by nature to their function [abstract]    
Depreciation of PP&E 712,000 0
Impairment 5,143,000 2,363,000
Amortization expense 1,076,000 0
Impairment loss recognised in profit or loss, property, plant and equipment 648,000 858,000
Cost optimization program    
Disclosure of attribution of expenses by nature to their function [abstract]    
Impairment 2,232,000 0
Impairment loss recognised in profit or loss, property, plant and equipment $ 1,938,000 $ 0