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Amortization, depreciation and impairment (Tables)
 12 Months Ended
Sep. 30, 2022
Analysis of income and expense [abstract]  
Disclosure of amortization, depreciation and impairment
Year ended September 30
2022 2021
$ $
 Depreciation of PP&E (Note 6)
 133,651  144,423 
 Depreciation of right-of-use assets (Note 7)
 141,295  160,240 
 Impairment of right-of-use assets (Note 7)
 1,495  956 
 Amortization of contract costs related to transition costs 48,594  61,369 
 Impairment of contract costs related to transition costs —  4,592 
 Amortization of intangible assets (Note 9)
 139,940  129,861 
 Impairment of intangible assets (Note 9)
 3,359  4,121 
 Included in costs of services, selling and administrative (Note 23)
 468,334  505,562 
Amortization of contract costs related to incentives (presented as a reduction of revenue) 2,201  2,611 
 Amortization of deferred financing fees (presented in finance costs) 829  875 
Amortization of premiums and discounts on investments related to funds held for clients (presented net as a reduction (increase) of revenue) 37  (102)
 Impairment of PP&E (presented in integration costs) (Note 6)
 858  1,113 
 Impairment of right-of-use assets (presented in integration costs) (Note 7)
 2,363  511 
474,622  510,570