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Accounts receivable
12 Months Ended
Sep. 30, 2023
Subclassifications of assets, liabilities and equities [abstract]  
Accounts receivable Accounts receivable
As at
September 30, 2023
As at
September 30, 2022
$ $
 Trade (Note 32)
1,152,880  1,106,187 
 R&D and other tax credits1
157,668  163,608 
 Discount incentives
57,714  47,906 
 Other
56,855  45,844 
1,425,117  1,363,545 
1    R&D and other tax credits were related to government programs mainly in Canada, the United States, and France.