Trade receivables - Additional Information (Detail) - INR (₨) ₨ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Trade receivables [Line Items] | ||
| Reversal for credit losses | ₨ 209 | |
| Net of provision for credit losses | 281 | ₨ 1,001 |
| Unbilled Revenue | ₨ 6,983 | ₨ 6,547 |
| Bottom of Range | ||
| Trade receivables [Line Items] | ||
| Trade receivables, collection period | 7 days | |
| Top of Range | ||
| Trade receivables [Line Items] | ||
| Trade receivables, collection period | 60 days | |