Deferred tax assets (DTA) (net) / deferred tax liabilities (DTL) (net) - Summary of Reconciliation of Tax Expense & Accounting Profit Multiplied By Tax Rate (Parenthetical) (Detail) - INR (₨) ₨ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Reconciliation of average effective tax rate and applicable tax rate [abstract] | |||
| Applicable tax rate | 25.168% | 25.168% | |
| Amount of net unrecognised deferred tax assets | ₨ 0 | ₨ 2,030 | ₨ 1,064 |
| Previously unrecognised DTA realised | 1,922 | ||
| One time charge for moving alternate lower tax regime | ₨ 693 | ||