Trade Receivables - Summary of Allowance for Lifetime Expected Credit Loss (Detail) - INR (₨) ₨ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Disclosure of financial assets [abstract] | ||
| Balance at the beginning of the year | ₨ 6,171 | ₨ 6,316 |
| Additions due to Acquisitions | 159 | 0 |
| Additions, net (Refer to Note 25) | 2,838 | 324 |
| Additions on account of Unbilled Receivables | (698) | 0 |
| Charged against allowance | (1,288) | (512) |
| Translation adjustment | 534 | 43 |
| Balance at the end of the year | ₨ 7,716 | ₨ 6,171 |