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Earnings per share (Tables) | 12 Months Ended
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Sep. 30, 2022
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:
| 2022 | 2021
| Net earnings | Weighted average number of shares outstanding 1 | Earnings per share | Net earnings | Weighted average number of shares outstanding 1 | 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 PSUs 2 |  | 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.

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- Definition The disclosure of earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2021-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_66&doctype=Standard -URIDate 2021-03-24 + Details
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