Income taxes (Details Textual) - INR (₨) ₨ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure Of Movement in deferred tax assets and liabilities [Line Items] | |||
| Deferred income taxes not recognized on undistributed earnings of subsidiaries | ₨ 48,978 | ₨ 43,442 | |
| Exchange Differences on Foreign Currency translations Recognised In Income Statement On Deferred Tax | ₨ 490 | ₨ 10 | |
| Effective tax rate | 23.00% | 25.00% | 23.00% |
| Tax rate effect of tax losses | 15.00% | ||
| Top of range [member] | |||
| Disclosure Of Movement in deferred tax assets and liabilities [Line Items] | |||
| Effective tax rate | 15.00% | ||
| Profit Tax Impact [Member] | |||
| Disclosure Of Movement in deferred tax assets and liabilities [Line Items] | |||
| Uncertain tax positions | ₨ 2,935 | ₨ 2,875 | |