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Accounts receivable
12 Months Ended
Sep. 30, 2025
Subclassifications of assets, liabilities and equities [abstract]  
Accounts receivable Accounts receivable
As at
September 30, 2025
As at
September 30, 2024
$ $
Trade (Note 32) 1,343,282  1,117,712 
Tax credits and R&D tax credits 167,599  149,955 
Other 102,896  130,735 
1,613,777  1,398,402