v3.26.1
Material accounting policies information (Details 1)
 12 Months Ended
Mar. 31, 2026
Factory and administrative buildings [Member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 20 years
Factory and administrative buildings [Member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 50 years
Ancillary structures [Member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 3 years
Ancillary structures [Member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 15 years
Plant and equipment [member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 3 years
Plant and equipment [member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 15 years
Furniture, fixtures and office equipment [Member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 3 years
Furniture, fixtures and office equipment [Member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 10 years
Vehicles [Member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 4 years
Vehicles [Member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 5 years