v3.25.2
Summary of Material Accounting Policies - Summary of Depreciation and amortisation are calculated on a straight-line basis over the estimated useful lives of the assets (Detail)
 12 Months Ended
Mar. 31, 2025
Plant and equipment (solar rooftop projects)  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 25 years
Plant and equipment (solar rooftop projects) | Bottom of range [member]  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 15 years
Plant and equipment (solar rooftop projects) | Top of range [member]  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 25 years
Plant and equipment (solar power projects)  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 35 years
Plant and equipment (wind power projects)  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 30 years
Plant and equipment (hydro power projects) | Bottom of range [member]  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 25 years
Plant and equipment (hydro power projects) | Top of range [member]  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 45 years
Plant and equipment (transmission projects)  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 50 years
Plant and equipment (cell and module manufacturing)  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 10 years
Plant and equipment (others) | Bottom of range [member]  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 5 years
Plant and equipment (others) | Top of range [member]  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 18 years
Office Equipment [Member]  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 5 years
Furniture and fixtures  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 10 years
Computers  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 3 years
Computer Servers  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 6 years
Computer software | Bottom of range [member]  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 3 years
Computer software | Top of range [member]  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 6 years
Other Intangible assets  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 5 years
Customer contracts  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 25 years
Development rights  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 25 years
Carbon credit rights  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 5 years
Leasehold improvements  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 5 years
Building (Temporary structure)  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 3 years
Building (other than Temporary structure)  
Disclosure Of Depreciation Amortization Of Tangible And Intangible Assets [Line Items]  
Useful life measured as period of time, property, plant and equipment 30 years