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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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- Definition

The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits.

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The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

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