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, 2026
INR (₨)
|
Mar. 31, 2026
USD ($)
|
Mar. 31, 2025
INR (₨)
|
Mar. 31, 2024
INR (₨)
|
|
| Interest Income For Amortised Cost [Abstract] | ||||
| on fixed deposit with banks | ₨ 3,871 | $ 41 | ₨ 3,804 | ₨ 3,937 |
| on loan given to related party (refer Note 42) | 4 | 0 | 9 | 4 |
| on safeguard duty recoverable | 121 | 1 | 135 | 131 |
| others | 65 | 1 | 18 | 15 |
| Gain on fair value changes on derivative instruments | 776 | 8 | 122 | 151 |
| Unwinding of contract assets (refer Note 53) | 154 | 2 | 183 | 530 |
| Unwinding of financial assets (refer Note 34(i)) | 83 | 1 | 301 | 504 |
| Total | ₨ 5,074 | $ 54 | ₨ 4,572 | ₨ 5,272 |