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Earnings per share (Details) - CAD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Earnings per share [line items] |  |
Basic net earnings | $ 1,466,142 | $ 1,369,072
Diluted net earnings | $ 1,466,142 | $ 1,369,072
Basic weighted average number of ordinary shares outstanding (in shares) | 239,262,004 | 249,119,219
Net effect of dilutive stock options and PSUs (in shares) | 3,605,441 | 3,969,661
Diluted weighted average number of ordinary shares outstanding (in shares) | 242,867,445 | 253,088,880
Basic earnings per share (CAD per share) | $ 6.13 | $ 5.50
Diluted earnings per share (CAD per share) | $ 6.04 | $ 5.41
Anti-dilutive securities excluded from computation of earnings per share (in shares) | 307,272 | 1,276,809
Class A subordinate voting shares | Capital stock |  |
Earnings per share [line items] |  |
Anti-dilutive securities excluded from computation of earnings per share (in shares) | 1,841,709 | 15,460,465
PSUs | Class A subordinate voting shares | Capital stock |  |
Earnings per share [line items] |  |
Anti-dilutive securities excluded from computation of earnings per share (in shares) | 8,839,439 | 1,433,521

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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator). + 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2021-01-01 -Paragraph 67 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_67&doctype=Standard -URIDate 2021-03-24 + Details
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