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Amortization, depreciation and impairment
 12 Months Ended
Sep. 30, 2025
Analysis of income and expense [abstract]  
Amortization, depreciation and impairment Amortization, depreciation and impairment
Year ended September 30
2025 2024
$ $
 Depreciation of PP&E (Note 6)
 134,243  134,818 
 Impairment of PP&E (Note 6)
 —  115 
 Depreciation of right-of-use assets (Note 7)
 138,240  126,615 
 Impairment of right-of-use assets (Note 7)
 768  — 
 Amortization of contract costs related to transition costs 74,059  59,191 
 Impairment of contract costs related to transition costs —  4,254 
 Amortization of intangible assets (Note 9)
 231,639  185,741 
 Impairment of intangible assets (Note 9)
 6,716  11,574 
 Included in costs of services, selling and administrative (Note 23)
 585,665  522,308 
Amortization of contract costs related to incentives (presented as a reduction of revenue) 4,170  2,806 
 Amortization of deferred financing fees (presented in finance costs) 575  630 
Amortization of discounts on investments related to funds held for clients
(presented net as an increase of revenue)
 (39) (1,584)
Impairment of PP&E (presented in integration costs) (Note 6)
 360  149 
Impairment of PP&E (presented in restructuring and in cost optimization program)
(Note 6 and 25)
 1,526  2,431 
 Impairment of right-of-use assets (presented in integration costs) (Note 7)
 19,125  — 
Impairment of right-of-use assets (presented in restructuring and in cost optimization
program) (Note 7 and 25)
 2,656  10,119 
Impairment of intangible assets (presented in restructuring) (Note 9 and 25)
 228  — 
614,266  536,859