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Financial instruments - Financial instruments by type or interest rate (Details) $ in Thousands, $ in Thousands | Sep. 30, 2022 CAD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 CAD ($)
--- | --- | --- | ---
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [line items] |  |  |
Assets | $ 15,175,420 |  | $ 15,021,021
Interest rate swaps | Interest rate risk |  |  |
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [line items] |  |  |
Notional amount |  | $ 250 |
Receive Rate | 4.99% | 4.99% |
Pay Rate | 3.26% | 3.26% |
Interest rate swaps | At fair value | Interest rate risk |  |  |
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [line items] |  |  |
Assets | $ 0 |  | $ 1,043

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