Finance income and fair value change in derivative instruments - Summary of Finance income and fair value change in derivative instruments (Detail) ₨ in Millions, $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
|
Mar. 31, 2025
INR (₨)
|
Mar. 31, 2025
USD ($)
|
Mar. 31, 2024
INR (₨)
|
Mar. 31, 2023
INR (₨)
|
|
| Interest Income For Amortised Cost [Abstract] | ||||
| on fixed deposit with banks | ₨ 3,804 | $ 45 | ₨ 3,937 | ₨ 2,010 |
| on loan given to related party (refer Note 42) | 9 | 0 | 4 | |
| on safeguard duty recoverable | 135 | 2 | 131 | 132 |
| others | 18 | 0 | 15 | 34 |
| Gain on fair value changes on derivative instruments (other than hedge instruments) | 122 | 1 | 151 | 139 |
| Unwinding of contract assets (refer Note 52) | 183 | 2 | 530 | 154 |
| Unwinding of financial assets (refer Note 34(i)) | 301 | 4 | 504 | 441 |
| Total | ₨ 4,572 | $ 54 | ₨ 5,272 | ₨ 2,910 |