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Share capital and Contributed Surplus - Schedule of changes in share units (Details) - share | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Disclosure of classes of share capital [line items] |  |
Outstanding, beginning of year | 21,273 | 0
Granted | 28,668 | 21,412
Vested and converted to common shares | (8,347) | (139)
Vested and repurchased for withholding taxes | (393) |
Expired / cancelled | (17,714) |
Outstanding, end of year | 24,001 | 21,273
Restricted share units [Member] |  |
Disclosure of classes of share capital [line items] |  |
Outstanding, beginning of year | 16,273 | 0
Granted | 10,726 | 16,412
Vested and converted to common shares | (5,681) | (139)
Vested and repurchased for withholding taxes | (144) |
Expired / cancelled | 0 |
Outstanding, end of year | 21,174 | 16,273
Performance stock units [Member] |  |
Disclosure of classes of share capital [line items] |  |
Outstanding, beginning of year | 2,857 | 0
Granted | 17,942 | 2,857
Vested and converted to common shares | (2,666) | 0
Vested and repurchased for withholding taxes | (249) |
Expired / cancelled | (17,714) |
Outstanding, end of year | 170 | 2,857
Share appreciation rights [Member] |  |
Disclosure of classes of share capital [line items] |  |
Outstanding, beginning of year | 2,143 | 0
Granted | 514 | 2,143
Vested and converted to common shares | 0 | 0
Vested and repurchased for withholding taxes | 0 |
Expired / cancelled | 0 |
Outstanding, end of year | 2,657 | 2,143

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