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Amortization, depreciation and impairment
 12 Months Ended
Sep. 30, 2024
Analysis of income and expense [abstract]  
Amortization, depreciation and impairment Amortization, depreciation and impairment
Year ended September 30
2024 2023
$ $
 Depreciation of PP&E (Note 6)
 134,818  142,653 
 Impairment of PP&E (Note 6) 115  — 
 Depreciation of right-of-use assets (Note 7) 126,615  143,030 
 Impairment of right-of-use assets (Note 7) —  2,274 
 Amortization of contract costs related to transition costs 59,191  55,194 
 Impairment of contract costs related to transition costs 4,254  — 
 Amortization of intangible assets (Note 9) 185,741  162,971 
 Impairment of intangible assets (Note 9) 11,574  — 
 Included in costs of services, selling and administrative (Note 23) 522,308  506,122 
Amortization of contract costs related to incentives (presented as a reduction of revenue) 2,806  2,793 
 Amortization of deferred financing fees (presented in finance costs) 630  816 
Amortization of premiums and discounts on investments related to funds held for clients (presented net as an increase of revenue) (1,584) (1,832)
Depreciation of PP&E (presented in integration costs) (Note 6)
 —  712 
Impairment of PP&E (presented in integration costs) (Note 6) 149  648 
Impairment of PP&E (presented in cost optimization program) (Note 6 and 25) 2,431  1,938 
 Impairment of right-of-use assets (presented in integration costs) (Note 7)
 —  5,143 
Impairment of right-of-use assets (presented in cost optimization program) (Note 7 and 25)
 10,119  2,232 
Amortization of intangible assets (presented in integration costs) (Note 9) —  1,076 
536,859  519,648