Share warrants - Schedule of Warrant Obligations (Detail) - Warrant ₨ in Millions, $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
|
Mar. 31, 2026
INR (₨)
|
Mar. 31, 2026
USD ($)
|
Mar. 31, 2025
INR (₨)
|
Mar. 31, 2024
INR (₨)
|
|
| Disclosure of reserves within equity [line items] | ||||
| Beginning balance | ₨ 190 | ₨ 772 | ₨ 1,309 | |
| Foreign currency translation | 8 | 13 | 14 | |
| Converted to Public warrants | ||||
| Change in fair value | (184) | (595) | (551) | |
| Balance | 14 | $ 0 | 190 | 772 |
| Public Warrants | ||||
| Disclosure of reserves within equity [line items] | ||||
| Beginning balance | 156 | 558 | 915 | |
| Foreign currency translation | 8 | 10 | 9 | |
| Converted to Public warrants | 14 | 78 | 32 | |
| Change in fair value | (165) | (490) | (398) | |
| Balance | 13 | 0 | 156 | 558 |
| Private Warrants | ||||
| Disclosure of reserves within equity [line items] | ||||
| Beginning balance | 34 | 214 | 394 | |
| Foreign currency translation | 3 | 5 | ||
| Converted to Public warrants | (14) | (78) | (32) | |
| Change in fair value | (19) | (105) | (153) | |
| Balance | ₨ 1 | $ 0 | ₨ 34 | ₨ 214 |