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Other long-term liabilities
 12 Months Ended
Sep. 30, 2022
Subclassifications of assets, liabilities and equities [abstract]  
Other long-term liabilities Other long-term liabilities
As at
September 30, 2022		 As at
September 30, 2021
$ $
 Deferred revenue 90,371  59,349 
 Deferred compensation plan liabilities (Note 17)
 81,452  91,943 
 Other1
 20,285  51,370 
192,108  202,662 
1    As at September 30, 2021, other is mainly composed of $33,686,000 in relation with the deferral of the employer side social security payments under the U.S. Government Coronavirus Aid, Relief, and Economic Security Act (CARES Act). The amount related to CARES Act was nil as at September 30, 2022.