XML 92 R76.htm IDEA: XBRL DOCUMENT v3.25.3
Income taxes - Reconciliation of US federal statutory rate to its effective tax rate (Details)
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Income taxes    
US federal statutory rate 21.00% 21.00%
State taxes, net of federal benefit (1.90%) 3.20%
Statutory rate differential attributable to foreign operations 2.30% 1.60%
Executive compensation   (3.40%)
Stock-based compensation (10.10%) 3.20%
Change in valuation allowances (8.50%) (24.10%)
Other permanent differences (5.10%) (3.10%)
Effective income tax rate (2.30%) (1.60%)