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Earnings per share
12 Months Ended
Sep. 30, 2022
Earnings per share [abstract]  
Earnings per share Earnings per share
The following table sets forth the computation of basic and diluted earnings per share for the years ended September 30:
2022 2021
Net earnings
Weighted average number of shares outstanding1
Earnings per share Net earnings
Weighted average
number of shares outstanding1
Earnings per share
$ $ $ $
 Basic
1,466,142  239,262,004  6.13  1,369,072  249,119,219  5.50 
 Net effect of dilutive stock
    options and PSUs2
3,605,441  3,969,661 
Diluted 1,466,142  242,867,445  6.04  1,369,072  253,088,880  5.41 
1    During the year ended September 30, 2022, 8,839,439 Class A subordinate voting shares purchased for cancellation and 1,841,709 Class A subordinate voting shares held in trust were excluded from the calculation of weighted average number of shares outstanding as of the date of transaction (15,460,465 and 1,433,521, respectively during the year ended September 30, 2021).
2    The calculation of the diluted earnings per share excluded 307,272 stock options for the year ended September 30, 2022 (1,276,809 for the year ended September 30, 2021), as they were anti-dilutive.