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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, 2024
Sep. 30, 2023
Income Taxes [Abstract]    
Company's statutory tax rate 26.50% 26.50%
Effect of foreign tax rate differences (0.30%) (0.60%)
Final determination from agreements with tax authorities and expirations of statutes of limitations (0.30%) (0.50%)
Non-deductible and tax exempt items 0.30% 0.10%
Recognition of previously unrecognized temporary differences (0.30%) 0.00%
Minimum income tax charge 0.20% 0.30%
Effective income tax rate 26.10% 25.80%