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Other long-term liabilities
 12 Months Ended
Sep. 30, 2025
Subclassifications of assets, liabilities and equities [abstract]  
Other long-term liabilities Other long-term liabilities
As at
September 30, 2025		 As at
September 30, 2024
$ $
 Deferred revenue 153,872  137,450 
 Deferred compensation plan liabilities (Note 17)
 139,317  124,447 
 Other
 47,984  39,185 
341,173  301,082