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Contract costs
12 Months Ended
Sep. 30, 2022
Revenue From Contracts With Customers [Abstract]  
Contract costs Contract costs
As at September 30, 2022 As at September 30, 2021
Cost Accumulated amortization and impairment Net carrying amount Cost Accumulated amortization and impairment Net carrying amount
$ $ $ $ $ $
 Transition costs 481,836  225,468  256,368  487,106  262,311  224,795 
 Incentives 50,331  45,087  5,244  52,200  46,433  5,767 
532,167  270,555  261,612  539,306  308,744  230,562