Other assets - Summary Of Detailed Information About Other Assets (Parenthetical) (Detail) - INR (₨) ₨ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Statement [LineItem] | |||
| Cost to obtain contract amortization | ₨ 2,558 | ₨ 1,333 | ₨ 1,083 |
| Costs to fulfil contract amortization | ₨ 150 | ₨ 83 | ₨ 60 |