Related party disclosure - Summary of Detailed Information About Related Parties Explanatory (Detail) |
12 Months Ended |
|---|---|
Mar. 31, 2025 | |
| Fluence India ReNew JV Private Limited | |
| Disclosure Of Detailed Information About Related Parties [Line Items] | |
| Name Of Joint Venture | Fluence India ReNew JV Private Limited |
| Entities Owned Or Significantly Influenced By Key Management Personnel | ReNew Foundation | |
| Disclosure Of Detailed Information About Related Parties [Line Items] | |
| Name Of Entities Owned Or Significantly Influenced By Key Management Personnel Or Their Relatives | ReNew Foundation |
| Joint Control | 3E NV | |
| Disclosure Of Detailed Information About Related Parties [Line Items] | |
| Name Of Joint Venture | 3E NV |
| Joint Control | 3E Renewable Energy Software and Services Private Limited | |
| Disclosure Of Detailed Information About Related Parties [Line Items] | |
| Name Of Joint Venture | 3E Renewable Energy Software and Services Private Limited |