v3.26.3
Segment information - Schedule of Reportable Segments and Reconciliation to Consolidated Net Income (Details) - USD ($)
 6 Months Ended 12 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Oct. 31, 2025
Oct. 31, 2024
Oct. 31, 2023
Segment information - Schedule of Reportable Segments and Reconciliation to Consolidated Net Income (Details) [Line Items]          
Gross profits $ 6,199,289 $ 1,511,095 $ 3,386,601 $ 3,212,412 $ 3,215,622
Operating expenses (7,075,041) (1,976,883) 3,525,177 741,469 1,043,699
Operating loss (875,752) (465,788) (138,576) 2,470,943 2,171,923
Total other income, net 7,622 16,375 19,274 13,181 4,617
Provision for income taxes (205,963) (29,752) 202,900 380,767 316,927
Net loss (1,074,093) (479,165) $ (322,202) $ 2,103,357 $ 1,859,613
Wastewater treatment related [Member]          
Segment information - Schedule of Reportable Segments and Reconciliation to Consolidated Net Income (Details) [Line Items]          
Gross profits 3,178,502 1,511,095      
Operating expenses (3,825,822) (1,976,883)      
Operating loss (647,320) (465,788)      
Digital health and wellness related [Member]          
Segment information - Schedule of Reportable Segments and Reconciliation to Consolidated Net Income (Details) [Line Items]          
Gross profits 3,020,787 0      
Operating expenses (3,249,219) 0      
Operating loss $ (228,432) $ 0