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Contract costs
 12 Months Ended
Sep. 30, 2023
Revenue From Contracts With Customers [Abstract]  
Contract costs Contract costs
As at September 30, 2023 As at September 30, 2022
Cost Accumulated amortization and impairment Net carrying amount Cost Accumulated amortization and impairment Net carrying amount
$ $ $ $ $ $
 Transition costs 549,848  250,847  299,001  481,836  225,468  256,368 
 Incentives 52,331  42,886  9,445  50,331  45,087  5,244 
602,179  293,733  308,446  532,167  270,555  261,612