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Earnings per share (Tables)
12 Months Ended
Sep. 30, 2025
Earnings per share [abstract]  
Computation of basic and diluted earnings per share
The following table sets forth the computation of basic and diluted earnings per share for the years ended September 30:
2025 2024
Net earnings
Weighted average number of shares outstanding1
Earnings per share Net earnings
Weighted average
number of shares outstanding1
Earnings per share
$ $ $ $
Basic
1,658,285  222,693,319  7.45  1,692,715  228,074,108  7.42 
Net effect of dilutive stock
options and PSUs2
2,796,025  3,598,753 
Diluted 1,658,285  225,489,344  7.35  1,692,715  231,672,861  7.31 
1    During the year ended September 30, 2025, 8,861,543 Class A subordinate voting shares purchased for cancellation and 2,247,354 Class A subordinate voting shares held in trust were excluded from the calculation of the weighted average number of shares outstanding as of the date of transaction (6,528,608 and 2,601,356, respectively during the year ended September 30, 2024).
2    For the year ended September 30, 2025 and 2024, no stock options were excluded from the calculation of the diluted earnings per share as all stock options were dilutive.