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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, 2025
Sep. 30, 2024
Income Taxes [Abstract]    
Company's statutory tax rate 26.50% 26.50%
Effect of foreign tax rate differences (0.70%) (0.30%)
Final determination from agreements with tax authorities and expirations of statutes of limitations (0.40%) (0.30%)
Non-deductible and tax exempt items 0.50% 0.30%
Recognition of previously unrecognized temporary differences 0.00% (0.30%)
Minimum income tax charge 0.20% 0.20%
Changes in tax laws and rates (0.10%) 0.00%
Effective income tax rate 26.00% 26.10%