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Income taxes - Reconciliation of effective income tax rate from the combined federal and provincial canadian statutory tax rate (Details)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Income Taxes [Abstract]
Company's statutory tax rate	26.50%	26.50%
Effect of foreign tax rate differences	(1.00%)	(1.00%)
Final determination from agreements with tax authorities and expirations of statutes of limitations	(0.40%)	0.20%
Non-deductible and tax exempt items	0.00%	(0.40%)
Recognition of previously unrecognized temporary differences	0.00%	(0.20%)
Minimum income tax charge	0.40%	0.40%
Effective income tax rate	25.50%	25.50%

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- Definition

Income Taxes [Abstract]

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Tax Rate Effect Of Expense Not Deductible In Determining Taxable Profit (Loss) And Revenues Exempt From Taxation

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Tax Rate Effect Of Expense Not Deductible In Determining Taxable Profit (Tax Loss), Regulatory Settlements

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Tax Rate Effect Of Minimum Tax Charge

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Tax Rate Effect Of Recognition Of Previously Unrecognized Temporary Differences

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- Definition

The applicable income tax rate.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2021-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_ii&doctype=Standard
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The tax expense (income) divided by the accounting profit. [Refer: Accounting profit]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2021-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_ii&doctype=Standard
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The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the application of foreign tax rates. [Refer: Average effective tax rate; Applicable tax rate]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 12
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