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Remaining performance obligations
12 Months Ended
Sep. 30, 2023
Disclosure of performance obligations [abstract]  
Remaining performance obligations
22.     Remaining performance obligations
Remaining performance obligations relates to Company’s performance obligations that are partially or fully unsatisfied under fixed-fee arrangements recognized using the percentage-of-completion method.
The amount of the selling price allocated to remaining performance obligations as at September 30, 2023 is $982,531,000 ($919,664,000 as at September 30, 2022) and is expected to be recognized as revenue within a weighted average of 2 years (1.9 years as at September 30, 2022).